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Scenario planning, also called scenario thinking or scenario analysis, is a strategic planning method that some organizations use to make flexible long-term plans. It is in large part an adaptation and generalization of classic methods used by military intelligence.
The original method was that a group of analysts would generate simulation games for policy makers. The games combine known facts about the future, such as demographics, geography, military, political, industrial information, and mineral reserves, with plausible alternative social, technical, economic, environmental, educational, political and aesthetic (STEEEPA) trends which are key driving forces.
In business applications, the emphasis on gaming the behavior of opponents was reduced (shifting more toward a game against nature). At Royal Dutch/Shell for example, scenario planning was viewed as changing mindsets about the exogenous part of the world, prior to formulating specific strategies.
Scenario planning may involve aspects of systems thinking, specifically the recognition that many factors may combine in complex ways to create sometime surprising futures (due to non-linear feedback loops). The method also allows the inclusion of factors that are difficult to formalize, such as novel insights about the future, deep shifts in values, unprecedented regulations or inventions. Systems thinking used in conjunction with scenario planning leads to plausible scenario story lines because the causal relationship between factors can be demonstrated. In these cases when scenario planning is integrated with a systems thinking approach to scenario development, it is sometimes referred to as structural dynamics.
Crafting scenarios 
These combinations and permutations of fact and related social changes are called "scenarios." The scenarios usually include plausible, but unexpectedly important situations and problems that exist in some small form in the present day. Any particular scenario is unlikely. However, future studies analysts select scenario features so they are both possible and uncomfortable. Scenario planning helps policy-makers to anticipate hidden weaknesses and inflexibilities in organizations and methods.
When disclosed years in advance, these weaknesses can be avoided or their impacts reduced more effectively than if similar real-life problems were considered under duress of an emergency. For example, a company may discover that it needs to change contractual terms to protect against a new class of risks, or collect cash reserves to purchase anticipated technologies or equipment. Flexible business continuity plans with "PREsponse protocols" help cope with similar operational problems and deliver measurable future value-added.
Zero-sum game scenarios 
Strategic military intelligence organizations also construct scenarios. The methods and organizations are almost identical, except that scenario planning is applied to a wider variety of problems than merely military and political problems.
As in military intelligence, the chief challenge of scenario planning is to find out the real needs of policy-makers, when policy-makers may not themselves know what they need to know, or may not know how to describe the information that they really want.
Good analysts design wargames so that policy makers have great flexibility and freedom to adapt their simulated organizations. Then these simulated organizations are "stressed" by the scenarios as a game plays out. Usually, particular groups of facts become more clearly important. These insights enable intelligence organizations to refine and repackage real information more precisely to better serve the policy-makers' real-life needs. Usually the games' simulated time runs hundreds of times faster than real life, so policy-makers experience several years of policy decisions, and their simulated effects, in less than a day.
This chief value of scenario planning is that it allows policy-makers to make and learn from mistakes without risking career-limiting failures in real life. Further, policymakers can make these mistakes in a safe, unthreatening, game-like environment, while responding to a wide variety of concretely-presented situations based on facts. This is an opportunity to "rehearse the future," an opportunity that does not present itself in day-to-day operations where every action and decision counts.
How military scenario planning or scenario thinking is done 
- Decide on the key question to be answered by the analysis. By doing this, it is possible to assess whether scenario planning is preferred over the other methods. If the question is based on small changes or a very small number of elements, other more formalized methods may be more useful.
- Set the time and scope of the analysis. Take into consideration how quickly changes have happened in the past, and try to assess to what degree it is possible to predict common trends in demographics, product life cycles. A usual timeframe can be five to 10 years.
- Identify major stakeholders. Decide who will be affected and have an interest in the possible outcomes. Identify their current interests, whether and why these interests have changed over time in the past.
- Map basic trends and driving forces. This includes industry, economic, political, technological, legal, and societal trends. Assess to what degree these trends will affect your research question. Describe each trend, how and why it will affect the organisation. In this step of the process, brainstorming is commonly used, where all trends that can be thought of are presented before they are assessed, to capture possible group thinking and tunnel vision.
- Find key uncertainties. Map the driving forces on two axes, assessing each force on an uncertain/(relatively) predictable and important/unimportant scale. All driving forces that are considered unimportant are discarded. Important driving forces that are relatively predictable (ex. demographics) can be included in any scenario, so the scenarios should not be based on these. This leaves you with a number of important and unpredictable driving forces. At this point, it is also useful to assess whether any linkages between driving forces exist, and rule out any "impossible" scenarios (ex. full employment and zero inflation).
- Check for the possibility to group the linked forces and if possible, reduce the forces to the two most important. (To allow the scenarios to be presented in a neat xy-diagram)
- Identify the extremes of the possible outcomes of the two driving forces and check the dimensions for consistency and plausibility. Three key points should be assessed:
- Time frame: are the trends compatible within the time frame in question?
- Internal consistency: do the forces describe uncertainties that can construct probable scenarios.
- Vs the stakeholders: are any stakeholders currently in disequilibrium compared to their preferred situation, and will this evolve the scenario? Is it possible to create probable scenarios when considering the stakeholders? This is most important when creating macro-scenarios where governments, large organisations et al. will try to influence the outcome.
- Define the scenarios, plotting them on a grid if possible. Usually, two to four scenarios are constructed. The current situation does not need to be in the middle of the diagram (inflation may already be low), and possible scenarios may keep one (or more) of the forces relatively constant, especially if using three or more driving forces. One approach can be to create all positive elements into one scenario and all negative elements (relative to the current situation) in another scenario, then refining these. In the end, try to avoid pure best-case and worst-case scenarios.
- Write out the scenarios. Narrate what has happened and what the reasons can be for the proposed situation. Try to include good reasons why the changes have occurred as this helps the further analysis. Finally, give each scenario a descriptive (and catchy) name to ease later reference.
- Assess the scenarios. Are they relevant for the goal? Are they internally consistent? Are they archetypical? Do they represent relatively stable outcome situations?
- Identify research needs. Based on the scenarios, assess where more information is needed. Where needed, obtain more information on the motivations of stakeholders, possible innovations that may occur in the industry and so on.
- Develop quantitative methods. If possible, develop models to help quantify consequences of the various scenarios, such as growth rate, cash flow etc. This step does of course require a significant amount of work compared to the others, and may be left out in back-of-the-envelope-analyses.
- Converge towards decision scenarios. Retrace the steps above in an iterative process until you reach scenarios which address the fundamental issues facing the organization. Try to assess upsides and downsides of the possible scenarios.
Scenario planning in military applications 
Scenario planning is also extremely popular with military planners. Most states' department of war maintains a continuously-updated series of strategic plans to cope with well-known military or strategic problems. These plans are almost always based on scenarios, and often the plans and scenarios are kept up-to-date by war games, sometimes played out with real troops. This process was first carried out (arguably the method was invented by) the Prussian general staff of the mid-19th century.
Development of scenario analysis in business organizations 
In the past, strategic plans have often considered only the "official future," which was usually a straight-line graph of current trends carried into the future. Often the trend lines were generated by the accounting department, and lacked discussions of demographics, or qualitative differences in social conditions.
These simplistic guesses are surprisingly good most of the time, but fail to consider qualitative social changes that can affect a business or government. Scenarios focus on the joint effect of many factors. Scenario planning helps us understand how the various strands of a complex tapestry move if one or more threads are pulled. When you just list possible causes, as for instance in fault tree analysis, you may tend to discount any one factor in isolation. But when you explore the factors together, you realize that certain combinations could magnify each other’s impact or likelihood. For instance, an increased trade deficit may trigger an economic recession, which in turn creates unemployment and reduces domestic production. Paul J. H. Schoemaker offers a strong managerial case for the use of scenario planning in business and had wide impact.
Scenarios planning starts by dividing our knowledge into two broad domains: (1) things we believe we know something about and (2) elements we consider uncertain or unknowable. The first component – trends – casts the past forward, recognizing that our world possesses considerable momentum and continuity. For example, we can safely make assumptions about demographic shifts and, perhaps, substitution effects for certain new technologies. The second component – true uncertainties – involve indeterminables such as future interest rates, outcomes of political elections, rates of innovation, fads and fashions in markets, and so on. The art of scenario planning lies in blending the known and the unknown into a limited number of internally consistent views of the future that span a very wide range of possibilities.
Numerous organizations have applied scenario planning to a broad range of issues, from relatively simple, tactical decisions to the complex process of strategic planning and vision building. The power of scenario planning for business was originally established by Royal Dutch/Shell, which has used scenarios since the early 1970s as part of a process for generating and evaluating its strategic options. Shell has been consistently better in its oil forecasts than other major oil companies, and saw the overcapacity in the tanker business and Europe’s petrochemicals earlier than its competitors. But ironically, the approach may have had more impact outside Shell than within, as many others firms and consultancies started to benefit as well from scenario planning. Scenario planning is as much art as science, and prone to a variety of traps (both in process and content) as enumerated by Paul J. H. Schoemaker.
History of use by academic and commercial organizations 
Most authors attribute the introduction of scenario planning to Herman Kahn through his work for the US Military in the 1950s at the RAND corporation where he developed a technique of describing the future in stories as if written by people in the future. He adopted the term "scenarios" to describe these stories. In 1961 he founded the Hudson Institute where he expanded his scenario work to social forecasting and public policy  One of his most controversial uses of scenarios was to suggest that a nuclear war could be won. Though Kahn is often cited as the father of scenario planning, at the same time Kahn was developing his methods at RAND, Gaston Berger was developing similar methods at the Centre d’Etudes Prospectives which he founded in France. His method, which he named 'La Prospective', was to develop normative scenarios of the future which were to be used as a guide in formulating public policy. During the mid-1960s various authors from the French and American institutions began to publish scenario planning concepts such as 'La Prospective' by Berger in 1964 and 'The Next Thirty-Three Years' by Kahn and Wiener in 1967  By the 1970s scenario planning was in full swing with a number of institutions now established to provide support to business including the Hudson Foundation, the Stanford Research Institute (now SRI International), and the SEMA Metra Consulting Group in France. Several large companies also began to embrace scenario planning including Dutch Royal Shell and General Electric.
Possibly as a result of these very sophisticated approaches, and of the difficult techniques they employed (which usually demanded the resources of a central planning staff), scenarios earned a reputation for difficulty (and cost) in use. Even so, the theoretical importance of the use of alternative scenarios, to help address the uncertainty implicit in long-range forecasts, was dramatically underlined by the widespread confusion which followed the Oil Shock of 1973. As a result many of the larger organizations started to use the technique in one form or another. By 1983 Diffenbach reported that 'alternate scenarios' were the third most popular technique for long-range forecasting - used by 68% of the large organizations he surveyed.
Practical development of scenario forecasting, to guide strategy rather than for the more limited academic uses which had previously been the case, was started by Pierre Wack in 1971 at the Royal Dutch Shell group of companies - and it, too, was given impetus by the Oil Shock two years later. Shell has, since that time, led the commercial world in the use of scenarios - and in the development of more practical techniques to support these. Indeed, as - in common with most forms of long-range forecasting - the use of scenarios has (during the depressed trading conditions of the last decade) reduced to only a handful of private-sector organisations, Shell remains almost alone amongst them in keeping the technique at the forefront of forecasting.
There has only been anecdotal evidence offered in support of the value of scenarios, even as aids to forecasting; and most of this has come from one company - Shell. In addition, with so few organisations making consistent use of them - and with the timescales involved reaching into decades - it is unlikely that any definitive supporting evidenced will be forthcoming in the foreseeable future. For the same reasons, though, a lack of such proof applies to almost all long-range planning techniques. In the absence of proof, but taking account of Shell's well documented experiences of using it over several decades (where, in the 1990s, its then CEO ascribed its success to its use of such scenarios), can be significant benefit to be obtained from extending the horizons of managers' long-range forecasting in the way that the use of scenarios uniquely does.
Critique of Shell's use of scenario planning 
In the 1970s, many energy companies were surprised by both environmentalism and the OPEC cartel, and thereby lost billions of dollars of revenue by mis-investment. The dramatic financial effects of these changes led at least one organization, Royal Dutch Shell, to implement scenario planning. The analysts of this company publicly estimated that this planning process made their company the largest in the world. However other observers of Shell's use of scenario planning have suggested that few if any significant long term business advantages accrued to Shell from the use of scenario methodology. Whilst the intellectual robustness of Shell's long term scenarios was seldom in doubt their actual practical use was seen as being minimal by many senior Shell executives. A Shell insider has commented "The scenario team were bright and their work was of a very high intellectual level. However neither the high level "Group scenarios" nor the country level scenarios produced with operating companies really made much difference when key decisions were being taken".[source missing]
The use of scenarios was audited by Arie de Geus's team in the early 1980s and they found that the decision making processes following the scenarios were the primary cause of the lack of strategic implementation, rather than the scenarios themselves. Many practitioners today spend as much time on the decision making process as on creating the scenarios themselves.
In 2005, Peter Cornelius, Alexander Van de Putte and Mattia Romani, all former Shell Planners, published a seminal paper on Three decades of Scenario Planning in Shell in the California Management Review. This article reviewed the use and evolution of scenario planning in Shell.
General Limitations of Scenario Planning 
Although scenario planning has gained much adherence in industry, its subjective and heuristic nature leaves many academics uncomfortable. How do we know if we have the right scenarios? And how do we go from scenarios to decisions? These concerns are legitimate and scenario planning would gain in academic standing if more research were conducted on its comparative performance and underlying theoretical premises. A collection of chapters by noted scenario planners failed to contain a single reference to an academic source! In general, there are few academically validated analyses of scenario planning (for a notable exception, see Paul J. H. Schoemaker). The technique was born from practice and its appeal is based more on anecdotal than scientific evidence. Furthermore, significant misconceptions remain about its intent and claims. Above all, scenario planning is a tool for collective learning, reframing perceptions and preserving uncertainty when the latter is pervasive. Too many decision makers want to bet on one future scenario, falling prey to the seductive temptation of trying to predict the future rather than to entertain multiple futures. Another trap is to take the scenarios too literally as though they were static beacons that map out a fixed future. In actuality, their aim is to bound the future but in a flexible way that permits learning and adjustment as the future unfolds.
One criticism of the two-by-two technique commonly used is that the resulting matrix results in four somewhat arbitrary scenario themes. If other key uncertainties had been selected, it might be argued, very different scenarios could emerge. How true this is depends on whether the matrix is viewed as just a starting point to be superseded by the ensuing blueprint or is considered as the grand architecture that nests everything else. In either case, however, the issue should not be which are the “right” scenarios but rather whether they delineate the range of possible future appropriately. Any tool that tries to simplify a complex picture will introduce distortions, whether it is a geographic map or a set of scenarios. Seldom will complexity decompose naturally into simple states. But it might. Consider, for example, the behavior of water (the molecule H2O) which, depending on temperature and pressure, naturally exists in just one of three states: gas, liquid or ice. The art of scenarios is to look for such natural states or points of bifurcation in the behavior of a complex system.
Apart from some inherent subjectivity in scenario design, the technique can suffer from various process and content traps. These traps mostly relate to how the process is conducted in organizations (such as team composition, role of facilitators, etc.) as well as the substantive focus of the scenarios (long vs. short term, global vs. regional, incremental vs. paradigm shifting, etc.). One might think of these as merely challenges of implementation, but since the process component is integral to the scenario experience, they can also be viewed as weaknesses of the methodology itself. Limited safeguards exist against political derailing, agenda control, myopia and limited imagination when conducting scenario planning exercises within real organizations. But, to varying extents, all forecasting techniques will suffer from such organizational limitations. The benchmark to use is not perfection, especially when faced with high uncertainty and complexity, or even strict adherence to such normative precepts as procedural invariance and logical consistency, but whether the technique performs better than its rivals. And to answer this question fairly, performance must be carefully specified. It should clearly include some measures of accuracy as well as a cost-benefit analysis that considers the tradeoff between effort and accuracy. In addition, legitimation criteria may be important to consider as well as the ability to refine and improve the approach as more experience is gained.
A third limitation of scenario planning in organizational settings is its weak integration into other planning and forecasting techniques. Most companies have plenty of trouble dealing with just one future, let alone multiple ones. Typically, budgeting and planning systems are predicated on single views of the future, with adjustments made as necessary through variance analysis, contingency planning, rolling budgets, and periodic renegotiations. The weaknesses of these traditional approaches were very evident after the tragic attack of September 11, 2001 when many companies became paralyzed and quite a few just threw away the plan and budget. Their strategies were not future-proof and they lacked organized mechanisms to adjust to external turmoil. In cases of crisis, leadership becomes important but so does some degree of preparedness. Once the scenarios are finished, the real works starts of how to craft flexible strategies and appropriate monitoring systems. Managers need a simple but comprehensive compass to navigate uncertainty from beginning to end. Scenario planning is just one component of a more complete management system. The point is that scenario thinking needs to be integrated with the existing planning and budgeting system, as awkward as this fit may be. The reality is that most organizations do not handle uncertainty well and that researchers have not provided adequate answers about how to plan under conditions of high uncertainty and complexity.
Use of scenario planning by managers 
The basic concepts of the process are relatively simple. In terms of the overall approach to forecasting, they can be divided into three main groups of activities (which are, generally speaking, common to all long range forecasting processes):
- Environmental analysis
- Scenario planning
- Corporate strategy
The first of these groups quite simply comprises the normal environmental analysis. This is almost exactly the same as that which should be undertaken as the first stage of any serious long-range planning. However, the quality of this analysis is especially important in the context of scenario planning.
The central part represents the specific techniques - covered here - which differentiate the scenario forecasting process from the others in long-range planning.
The final group represents all the subsequent processes which go towards producing the corporate strategy and plans. Again, the requirements are slightly different but in general they follow all the rules of sound long-range planning.
The part of the overall process which is radically different from most other forms of long-range planning is the central section, the actual production of the scenarios. Even this, though, is relatively simple, at its most basic level. As derived from the approach most commonly used by Shell, it follows six steps:
- Decide drivers for change/assumptions
- Bring drivers together into a viable framework
- Produce 7-9 initial mini-scenarios
- Reduce to 2-3 scenarios
- Draft the scenarios
- Identify the issues arising
Step 1 - decide assumptions/drivers for change 
The first stage is to examine the results of environmental analysis to determine which are the most important factors that will decide the nature of the future environment within which the organisation operates. These factors are sometimes called 'variables' (because they will vary over the time being investigated, though the terminology may confuse scientists who use it in a more rigorous manner). Users tend to prefer the term 'drivers' (for change), since this terminology is not laden with quasi-scientific connotations and reinforces the participant's commitment to search for those forces which will act to change the future. Whatever the nomenclature, the main requirement is that these will be informed assumptions.
This is partly a process of analysis, needed to recognise what these 'forces' might be. However, it is likely that some work on this element will already have taken place during the preceding environmental analysis. By the time the formal scenario planning stage has been reached, the participants may have already decided - probably in their sub-conscious rather than formally - what the main forces are.
In the ideal approach, the first stage should be to carefully decide the overall assumptions on which the scenarios will be based. Only then, as a second stage, should the various drivers be specifically defined. Participants, though, seem to have problems in separating these stages.
Perhaps the most difficult aspect though, is freeing the participants from the preconceptions they take into the process with them. In particular, most participants will want to look at the medium term, five to ten years ahead rather than the required longer-term, ten or more years ahead. However, a time horizon of anything less than ten years often leads participants to extrapolate from present trends, rather than consider the alternatives which might face them. When, however, they are asked to consider timescales in excess of ten years they almost all seem to accept the logic of the scenario planning process, and no longer fall back on that of extrapolation. There is a similar problem with expanding participants horizons to include the whole external environment.
In any case, the brainstorming which should then take place, to ensure that the list is complete, may unearth more variables - and, in particular, the combination of factors may suggest yet others.
A very simple technique which is especially useful at this - brainstorming - stage, and in general for handling scenario planning debates is derived from use in Shell where this type of approach is often used. An especially easy approach, it only requires a conference room with a bare wall and copious supplies of 3M Post-It Notes.
The six to ten people ideally taking part in such face-to-face debates should be in a conference room environment which is isolated from outside interruptions. The only special requirement is that the conference room has at least one clear wall on which Post-It notes will stick. At the start of the meeting itself, any topics which have already been identified during the environmental analysis stage are written (preferably with a thick magic marker, so they can be read from a distance) on separate Post-It Notes. These Post-It Notes are then, at least in theory, randomly placed on the wall. In practice, even at this early stage the participants will want to cluster them in groups which seem to make sense. The only requirement (which is why Post-It Notes are ideal for this approach) is that there is no bar to taking them off again and moving them to a new cluster.
A similar technique - using 5" by 3" index cards - has also been described (as the 'Snowball Technique'), by Backoff and Nutt, for grouping and evaluating ideas in general.
As in any form of brainstorming, the initial ideas almost invariably stimulate others. Indeed, everyone should be encouraged to add their own Post-It Notes to those on the wall. However it differs from the 'rigorous' form described in 'creative thinking' texts, in that it is much slower paced and the ideas are discussed immediately. In practice, as many ideas may be removed, as not being relevant, as are added. Even so, it follows many of the same rules as normal brainstorming and typically lasts the same length of time - say, an hour or so only.
It is important that all the participants feel they 'own' the wall - and are encouraged to move the notes around themselves. The result is a very powerful form of creative decision-making for groups, which is applicable to a wide range of situations (but is especially powerful in the context of scenario planning). It also offers a very good introduction for those who are coming to the scenario process for the first time. Since the workings are largely self-evident, participants very quickly come to understand exactly what is involved.
Important and uncertain
This step is, though, also one of selection - since only the most important factors will justify a place in the scenarios. The 80:20 Rule here means that, at the end of the process, management's attention must be focused on a limited number of most important issues. Experience has proved that offering a wider range of topics merely allows them to select those few which interest them, and not necessarily those which are most important to the organisation.
In addition, as scenarios are a technique for presenting alternative futures, the factors to be included must be genuinely 'variable'. They should be subject to significant alternative outcomes. Factors whose outcome is predictable, but important, should be spelled out in the introduction to the scenarios (since they cannot be ignored). The Important Uncertainties Matrix, as reported by Kees van der Heijden of Shell, is a useful check at this stage.
At this point it is also worth pointing out that a great virtue of scenarios is that they can accommodate the input from any other form of forecasting. They may use figures, diagrams or words in any combination. No other form of forecasting offers this flexibility.
Step 2 - bring drivers together into a viable framework 
The next step is to link these drivers together to provide a meaningful framework. This may be obvious, where some of the factors are clearly related to each other in one way or another. For instance, a technological factor may lead to market changes, but may be constrained by legislative factors. On the other hand, some of the 'links' (or at least the 'groupings') may need to be artificial at this stage. At a later stage more meaningful links may be found, or the factors may then be rejected from the scenarios. In the most theoretical approaches to the subject, probabilities are attached to the event strings. This is difficult to achieve, however, and generally adds little - except complexity - to the outcomes.
This is probably the most (conceptually) difficult step. It is where managers' 'intuition' - their ability to make sense of complex patterns of 'soft' data which more rigorous analysis would be unable to handle - plays an important role. There are, however, a range of techniques which can help; and again the Post-It-Notes approach is especially useful:
Thus, the participants try to arrange the drivers, which have emerged from the first stage, into groups which seem to make sense to them. Initially there may be many small groups. The intention should, therefore, be to gradually merge these (often having to reform them from new combinations of drivers to make these bigger groups work). The aim of this stage is eventually to make 6 - 8 larger groupings; 'mini-scenarios'. Here the Post-It Notes may be moved dozens of times over the length - perhaps several hours or more - of each meeting. While this process is taking place the participants will probably want to add new topics - so more Post-It Notes are added to the wall. In the opposite direction, the unimportant ones are removed (possibly to be grouped, again as an 'audit trail' on another wall). More important, the 'certain' topics are also removed from the main area of debate - in this case they must be grouped in clearly labelled area of the main wall.
As the clusters - the 'mini-scenarios' - emerge, the associated notes may be stuck to each other rather than individually to the wall; which makes it easier to move the clusters around (and is a considerable help during the final, demanding stage to reducing the scenarios to two or three).
The great benefit of using Post-It Notes is that there is no bar to participants changing their minds. If they want to rearrange the groups - or simply to go back (iterate) to an earlier stage - then they strip them off and put them in their new position.
Step 3 - produce initial mini-scenarios 
The outcome of the previous step is usually between seven and nine logical groupings of drivers. This is usually easy to achieve. The 'natural' reason for this may be that it represents some form of limit as to what participants can visualise.
Having placed the factors in these groups, the next action is to work out, very approximately at this stage, what is the connection between them. What does each group of factors represent?
Step 4 - reduce to two or three scenarios 
The main action, at this next stage, is to reduce the seven to nine mini-scenarios/groupings detected at the previous stage to two or three larger scenarios. The challenge in practice seems to come down to finding just two or three 'containers' into which all the topics can be sensibly fitted. This usually requires a considerable amount of debate - but in the process it typically generates as much light as it does heat. Indeed, the demanding process of developing these basic scenario frameworks often, by itself, produces fundamental insights into what are the really important (perhaps life and death) issues affecting the organisation. During this extended debate - and even before it is summarised in the final reports - the participants come to understand, by their own involvement in the debate, what the most important drivers for change may be, and (perhaps even more important) what their peers think they are. Based on this intimate understanding, they are well prepared to cope with such changes - reacting almost instinctively - when they actually do happen; even without recourse to the formal reports which are eventually produced!
There is no theoretical reason for reducing to just two or three scenarios, only a practical one. It has been found that the managers who will be asked to use the final scenarios can only cope effectively with a maximum of three versions! Shell started, more than three decades ago, by building half a dozen or more scenarios - but found that the outcome was that their managers selected just one of these to concentrate on. As a result the planners reduced the number to three, which managers could handle easily but could no longer so easily justify the selection of only one! This is the number now recommended most frequently in most of the literature.
As used by Shell, and as favoured by a number of the academics, two scenarios should be complementary; the reason being that this helps avoid managers 'choosing' just one, 'preferred', scenario - and lapsing once more into single-track forecasting (negating the benefits of using 'alternative' scenarios to allow for alternative, uncertain futures). This is, however, a potentially difficult concept to grasp, where managers are used to looking for opposites; a good and a bad scenario, say, or an optimistic one versus a pessimistic one - and indeed this is the approach (for small businesses) advocated by Foster. In the Shell approach, the two scenarios are required to be equally likely, and between them to cover all the 'event strings'/drivers. Ideally they should not be obvious opposites, which might once again bias their acceptance by users, so the choice of 'neutral' titles is important. For example, Shell's two scenarios at the beginning of the 1990s were titled 'Sustainable World' and 'Global Mercantilism'[xv]. In practice, we found that this requirement, much to our surprise, posed few problems for the great majority, 85%, of those in the survey; who easily produced 'balanced' scenarios. The remaining 15% mainly fell into the expected trap of 'good versus bad'. We have found that our own relatively complex (OBS) scenarios can also be made complementary to each other; without any great effort needed from the teams involved; and the resulting two scenarios are both developed further by all involved, without unnecessary focusing on one or the other.
Having grouped the factors into these two scenarios, the next step is to test them, again, for viability. Do they make sense to the participants? This may be in terms of logical analysis, but it may also be in terms of intuitive 'gut-feel'. Once more, intuition often may offer a useful - if academically less respectable - vehicle for reacting to the complex and ill-defined issues typically involved. If the scenarios do not intuitively 'hang together', why not? The usual problem is that one or more of the assumptions turns out to be unrealistic in terms of how the participants see their world. If this is the case then you need to return to the first step - the whole scenario planning process is above all an iterative one (returning to its beginnings a number of times until the final outcome makes the best sense).
Step 5 - write the scenarios 
The scenarios are then 'written up' in the most suitable form. The flexibility of this step often confuses participants, for they are used to forecasting processes which have a fixed format. The rule, though, is that you should produce the scenarios in the form most suitable for use by the managers who are going to base their strategy on them. Less obviously, the managers who are going to implement this strategy should also be taken into account. They will also be exposed to the scenarios, and will need to believe in these. This is essentially a 'marketing' decision, since it will be very necessary to 'sell' the final results to the users. On the other hand, a not inconsiderable consideration may be to use the form the author also finds most comfortable. If the form is alien to him or her the chances are that the resulting scenarios will carry little conviction when it comes to the 'sale'.
Most scenarios will, perhaps, be written in word form (almost as a series of alternative essays about the future); especially where they will almost inevitably be qualitative which is hardly surprising where managers, and their audience, will probably use this in their day to day communications. Some, though use an expanded series of lists and some enliven their reports by adding some fictional 'character' to the material - perhaps taking literally the idea that they are stories about the future - though they are still clearly intended to be factual. On the other hand, they may include numeric data and/or diagrams - as those of Shell do (and in the process gain by the acid test of more measurable 'predictions').
Step 6 - identify issues arising 
The final stage of the process is to examine these scenarios to determine what are the most critical outcomes; the 'branching points' relating to the 'issues' which will have the greatest impact (potentially generating 'crises') on the future of the organisation. The subsequent strategy will have to address these - since the normal approach to strategy deriving from scenarios is one which aims to minimise risk by being 'robust' (that is it will safely cope with all the alternative outcomes of these 'life and death' issues) rather than aiming for performance (profit) maximisation by gambling on one outcome.
Use of scenarios 
It is important to note that scenarios may be used in a number of ways:
a) Containers for the drivers/event strings
Most basically, they are a logical device, an artificial framework, for presenting the individual factors/topics (or coherent groups of these) so that these are made easily available for managers' use - as useful ideas about future developments in their own right - without reference to the rest of the scenario. It should be stressed that no factors should be dropped, or even given lower priority, as a result of producing the scenarios. In this context, which scenario contains which topic (driver), or issue about the future, is irrelevant.
b) Tests for consistency
At every stage it is necessary to iterate, to check that the contents are viable and make any necessary changes to ensure that they are; here the main test is to see if the scenarios seem to be internally consistent - if they are not then the writer must loop back to earlier stages to correct the problem. Though it has been mentioned previously, it is important to stress once again that scenario building is ideally an iterative process. It usually does not just happen in one meeting - though even one attempt is better than none - but takes place over a number of meetings as the participants gradually refine their ideas.
c) Positive perspectives
Perhaps the main benefit deriving from scenarios, however, comes from the alternative 'flavours' of the future their different perspectives offer. It is a common experience, when the scenarios finally emerge, for the participants to be startled by the insight they offer - as to what the general shape of the future might be - at this stage it no longer is a theoretical exercise but becomes a genuine framework (or rather set of alternative frameworks) for dealing with that.
Scenario planning compared to other techniques 
Contingency planning is a "What if" tool, that only takes into account one uncertainty. However, scenario planning considers combinations of uncertainties in each scenario. Planners also try to select especially plausible but uncomfortable combinations of social developments.
Sensitivity analysis analyzes changes in one variable only, which is useful for simple changes, while scenario planning tries to expose policy makers to significant interactions of major variables.
While scenario planning can benefit from computer simulations, scenario planning is less formalized, and can be used to make plans for qualitative patterns that show up in a wide variety of simulated events.
During the past 5 years, computer supported Morphological Analysis has been employed as aid in scenario development by the Swedish Defence Research Agency in Stockholm. This method makes it possible to create a multi-variable morphological field which can be treated as an inference model – thus integrating scenario planning techniques with contingency analysis and sensitivity analysis.
Combination of Delphi and scenarios 
Scenario planning concerns planning based on the systematic examination of the future by picturing plausible and consistent images thereof. Delphi, in turn, attempts to develop systematically expert opinion consensus concerning future developments and events. It is a judgmental forecasting procedure in form of an anonymous, written, multi-stage survey process, where feedback of group opinion is provided after each round.
Numerous researchers have stressed that both approaches are best suited to be combined. Kinkel et al. (2006)  recently reported on their experiences with both Delphi-scenarios and scenario-Delphis. The authors found that, due to their process similarity, the two methodologies can be easily combined. Generally speaking, the output of the different phases of the Delphi method can be used as input for the scenario method and vice versa. A combination makes a realization of the benefits of both tools possible. In practice, usually one of the two tools is considered the dominant methodology and the other one is integrated at some stage. In fact, the authors found that in either case the combination of the methodologies adds significant value to futures projects.
The variant that is most often found in practice is the integration of the Delphi method into the scenario process (see e.g. Rikkonen, 2005; von der Gracht, 2007; Transportation & Logistics 2030 – How will supply chains evolve in an energy constrained and low-carbon world; Transportation & Logistics 2030 – Transport infrastructure – Engine or hand brakes for global supply chains?; Future of Logistics – Global Scenarios 2025). Authors refer to this type as Delphi-scenario (writing), expert-based scenarios, or Delphi panel derived scenarios. Von der Gracht (2010)  is a scientifically valid example of this method. Since scenario planning is “information hungry”, Delphi research can deliver valuable input for the process. There are various types of information output of Delphi that can be used as input for scenario planning. Researchers can, for example, identify relevant events or developments and, based on expert opinion, assign probabilities to them. Moreover, expert comments and arguments provide deeper insights into relationships of factors that can, in turn, be integrated into scenarios afterwards. Also, Delphi helps to identify extreme opinions and dissent among the experts. Such controversial topics are particularly suited for extreme scenarios or wildcards.
In his doctoral thesis, Rikkonen (2005)  has thoroughly examined the utilization of Delphi techniques in scenario planning and, concretely, in construction of scenarios. The author comes to the conclusion that the Delphi technique has instrumental value in providing different alternative futures and the argumentation of scenarios. It is therefore recommended to use Delphi in order to make the scenarios more profound and to create confidence in scenario planning. Further benefits lie in the simplification of the scenario writing process and the deep understanding of the interrelations between the forecast items and social factors.
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See also 
- Wikifutures wiki; Scenario page -- wiki also includes several scenarios (GFDL licensed)
- ScenarioThinking.org -- more than 100 scenarios developed on various global issues, on a wiki for public use
- The Process of Scenario Planning-- The post explains various process and steps involved in doing an effective scenario planning.
- Scenario-based strategic planning process-- detailed description of a scenario planning approach and several innovative scenario studies for public use
- Scenario planning for an interstellar exploration program-- using a scenario planning approach to assess the feasibility of a far future / large scale project