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Improvisational Theater, sometimes called just improv, is a form of theater where most or all of what is performed is created at the moment it is performed, with little or no pre-planning. In its purest form, the dialogue, the action, the story and the characters are created collaboratively by the players as the improvisation unfolds. In some forms, one or more of those attributes might be decided on beforehand while the others are created in the moment.
Improvisational Theater exists in performance as a range of styles of improvisational comedy as well as some non-comedic theatrical performances. It is sometimes used in film and television, both to develop characters and scripts and occasionally as part of the final product.
The skills and processes of improvisation are used outside of performance as well. It is often used extensively in drama programs to train actors for stage, film and television and can be an important part of the rehearsal process. It is used in classrooms and businesses as an educational tool and as a way to develop communication and brain-storming skills. It is sometimes used in psychotherapy as a tool to gain insight into a person's thoughts, feelings and relationships.
Improvised performance is as old as performance itself. The original performers were storytellers. From the 16th to the 18th centuries, Commedia dell'arte performers improvised based on a broad outline in the streets of Italy and in the 1890s theatrical theorists and directors such as Russian, Konstantin Stanislavski and the French, Jacques Copeau, founders of two major streams of acting theory, both heavily utilised improvisation in acting training and rehearsal.
Modern theatrical improvisation in the United States is generally accepted to have taken form in the improvisational acting exercises developed by Viola Spolin in the 1940s, 50s and 60s, now known as Theater Games, which she codified in her book Improvisation For The Theater. Some people credit American Dudley Riggs as the first vaudevillian to use audience suggestions to create improvised sketches. In the 1970s in Canada, British playwright and director Keith Johnstone wrote Impro: Improvisation and the Theatre, a book outlining his ideas on improvisation, and invented Theatresports which has become a staple of modern improvisational comedy and is the inspiration for the popular television show Whose Line Is It Anyway?
Spolin can probably be considered the American Grandmother of Improv. She influenced the first generation of Improv at The Compass Players in Chicago, which led to The Second City. Her son, Paul Sills, along with David Shepherd, started The Compass Players. Following the demise of the Compass Players, Paul Sills began The Second City. They were the first organized troupes in Chicago, Illinois, and the modern Chicago improvisational comedy movement grew from their success.
Many of the current "rules" of comedic improv were first formalized in Chicago in the late 1950s and early 1960s, initially among The Compass Players troupe, which was directed by Paul Sills. From most accounts David Shepherd provided the philosophical vision of the Compass Players, while Elaine May was central to the development of the premises for its improvisations. Mike Nichols, Ted Flicker, and Del Close were her most frequent collaborators in this regard. When The Second City opened its doors on December 16, 1959, directed by Paul Sill, his mother Viola Spolin began training new improvisers through a series of classes and exercises which became the cornerstone of modern improv training. By the mid 1960s, Viola Spolin's classes were handed over to her protégé, Jo Forsberg, who further developed Spolin's methods into a one-year course, which eventually became The Players Workshop, the first official school of improvisation in the USA. During this time Jo Forsberg trained many of the performers who went on to star on The Second City stage.
Many of the original cast of Saturday Night Live came from The Second City and the franchise has produced such comedy stars as Mike Myers, Tina Fey, Bob Odenkirk, Amy Sedaris, Stephen Colbert, Eugene Levy, Steve Carell, Chris Farley, Dan Aykroyd and John Belushi.
Simultaneously, Keith Johnstone's group The Theatre Machine, which originated in London, was touring Europe. This work gave birth to Theatresports, at first secretly in Johnstone's workshops, and eventually in public when he moved to Canada. Toronto has been home to a rich improv tradition.
In 1984 Dick Chudnow (Kentucky Fried Theater) founded ComedySportz in Milwaukee, WI. Expansion began with the addition of ComedySportz-Madison (WI), in 1985. The first Comedy League of America National Tournament was held in 1988, with 10 teams participating. The league is now known as World Comedy League and boasts a roster of 21 international cities.
When The Committee disbanded in 1972, Three major companies were formed: The Pitchell Players, The Wing, and Improvisation Inc, Improv, Inc. being the only company continuing to perform Del’s “Original” Harold. In 1976, two former Improv-Inc members, Michael Bossier and John Elk, formed Spaghetti Jam, performing Short-Form improv and Harolds in San Francisco’s famous Old Spaghetti Factory through 1983. Stand-Up comedians performing down the street at the Intersection for the Arts would drop by and sit in. "Improv Comedy" was born. In 1979 John Elk brought Short-Form to England, teaching workshops at Jacksons Lane Theatre and was the first American to perform at The Comedy Store, London, above a Soho strip club.
Modern political improvisation's roots include Jerzy Grotowski's work in Poland during the late 1950s and early 1960s, Peter Brook's "happenings" in England during the late 1960s, Augusto Boal's "Forum Theatre" in South America in the early 1970s, and San Francisco's The Diggers' work in the 1960s. Some of this work led to pure improvisational performance styles, while others simply added to the theatrical vocabulary and were, on the whole, avant garde experiments.
Joan Littlewood, the English actress and director who was active from the 1930s to 1970s, made extensive use of improv in developing plays for performance. However she was successfully prosecuted twice for allowing her actors to improvise in performance. Until 1968, British law required scripts to be approved by the Lord Chamberlain's Office. The department also sent inspectors to some performances to check that the approved script was complied with exactly as approved.
Improvisational comedy 
Modern improvisational comedy, as it is practiced in the West, falls generally into two categories: shortform and longform.
Shortform improv consists of short scenes usually constructed from a predetermined game, structure, or idea and driven by an audience suggestion. Many shortform games were first created by Viola Spolin based on her training from Neva Boyd. The shortform improv comedy television series Whose Line Is It Anyway? has familiarized American and British viewers with shortform.
Longform improv performers create shows in which short scenes are often interrelated by story, characters, or themes. Longform shows may take the form of an existing type of theatre, for example a full-length play or Broadway-style musical such as Spontaneous Broadway. Longform improvisation is especially performed in Chicago, New York City, San Francisco, Seattle, Los Angeles and has a growing following in Minneapolis, Detroit, Kansas City, Phoenix, Austin, New Orleans, Rochester, NY, Hawaii, and Toronto, Canada. One of the more well-known longform structures is the Harold, developed by ImprovOlympic cofounder Del Close. Many such longform structures now exist. In the UK the Comedy Store Players are a well known improv group, who are also in the Guinness World Records
Non-comedic improv 
Other forms of improvisational theatre training and performance techniques are experimental and Avant-garde in nature and not necessarily intended to be comedic. These include Playback Theatre and Theatre of the Oppressed, the Poor Theatre, the Open Theatre, to name only a few. Long Form improvisation has been growing on the west coast with such groups as True Fiction Magazine, Three for All and the Awkward Dinner Party. These formats are designed to allow for a full length play to be created improvisationally.
Applying improv principles in life 
Many people who have studied improv have noted that the guiding principles of improv are useful not just on stage but in everyday life. For example, Stephen Colbert in a commencement address said,
Well, you are about to start the greatest improvisation of all. With no script. No idea what's going to happen, often with people and places you have never seen before. And you are not in control. So say "yes." And if you're lucky, you'll find people who will say "yes" back.
Tina Fey in her book Bossypants lists several rules of improv that apply in the workplace. There has been much interest in bringing lessons from improv into the corporate world. In a New York Times article titled "Can Executives Learn to Ignore the Script?", Stanford professor and author, Patricia Ryan Madson notes, "executives and engineers and people in transition are looking for support in saying yes to their own voice. Often, the systems we put in place to keep us secure are keeping us from our more creative selves." Madson explores the application of thirteen "maxims of improvisational theater" to real-life in the book Improv Wisdom: Don’t Prepare, Just Show Up.
In film and television 
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Many directors have made use of improvisation in the creation of both main-stream and experimental films. Many silent filmmakers such as Charlie Chaplin and Buster Keaton used improvisation in the making of their films, developing their gags while filming and altering the plot to fit. The Marx Brothers were notorious for deviating from the script they were given, their ad libs often becoming part of the standard routine and making their way into their films. Many people, however, make a distinction between ad-libbing and improvising.
The British director Mike Leigh makes extensive use of improvisation in the creation of his films, including improvising important moments in the characters lives that will not even appear in the film. This Is Spinal Tap and other mockumentary films of director Christopher Guest are created with a mix of scripted and unscripted material and Blue in the Face is a 1995 comedy directed by Wayne Wang and Paul Auster created in part by the improvisations filmed during the production of their movie Smoke.
Improv comedy techniques have also been used in television and stand-up comedy, in hit shows such as the recent HBO television show Curb Your Enthusiasm created by Larry David, the UK Channel 4 and ABC television series Whose Line Is It Anyway (and its spinoffs Drew Carey's Green Screen Show and Drew Carey's Improv-A-Ganza), Nick Cannon's improv comedy show Wild 'N Out, and Thank God You're Here. In Canada, the long-running series Train 48 was improvised from scripts which contained a minimal outline of each scene. The American show Reno 911! also contained improvised dialogue based on a plot outline. Fast and Loose is an improvisational game show, much like Whose Line Is It Anyway?. The BBC Sitcoms Outnumbered and The Thick Of It also had some improvised elements in them.
In the field of the Psychology of Consciousness, explored the altered state of consciousness experienced by actors and improvisers in his scholarly paper Acting: an altered state of consciousness. According to G. WIlliam Farthing in The Psychology of Consciousness comparative study, actors routinely enter into an altered state of consciousness (ASC). Acting is seen as altering most of the 14 dimensions of changed subjective experience which characterize ASCs according to Farthing, namely: attention, perception, imagery and fantasy, inner speech, memory, higher-level thought processes, meaning or significance of experiences, time experience, emotional feeling and expression, level of arousal, self-control, suggestibility, body image, and sense of personal identity.
Structure and process 
Improvisational theatre often allows an interactive relationship with the audience. Improv groups frequently solicit suggestions from the audience as a source of inspiration, a way of getting the audience involved, and as a means of proving that the performance is not scripted. That charge is sometimes aimed at the masters of the art, whose performances can seem so detailed that viewers may suspect the scenes are planned.
In order for an improvised scene to be successful, the improvisers involved must work together responsively to define the parameters and action of the scene, in a process of co-creation. With each spoken word or action in the scene, an improviser makes an offer, meaning that he or she defines some element of the reality of the scene. This might include giving another character a name, identifying a relationship, location, or using mime to define the physical environment. These activities are also known as endowment. It is the responsibility of the other improvisers to accept the offers that their fellow performers make; to not do so is known as blocking, negation, or denial, which usually prevents the scene from developing. Some performers may deliberately block (or otherwise break out of character) for comedic effect—this is known as gagging—but this generally prevents the scene from advancing and is frowned upon by many improvisers. Accepting an offer is usually accompanied by adding a new offer, often building on the earlier one; this is a process improvisers refer to as "Yes, And..." and is considered the cornerstone of improvisational technique. Every new piece of information added helps the improvisers to refine their characters and progress the action of the scene.
The unscripted nature of improv also implies no predetermined knowledge about the props that might be useful in a scene. Improv companies may have at their disposal some number of readily accessible props that can be called upon at a moment's notice, but many improvisers eschew props in favor of the infinite possibilities available through mime. In improv, this is more commonly known as 'space object work' or 'space work', not 'mime', and the props and locations created by this technique, as 'space objects'. As with all improv offers, improvisers are encouraged to respect the validity and continuity of the imaginary environment defined by themselves and their fellow performers; this means, for example, taking care not to walk through the table or "miraculously" survive multiple bullet wounds from another improviser's gun.
Because improvisers may be required to play a variety of roles without preparation, they need to be able to construct characters quickly with physicality, gestures, accents, voice changes, or other techniques as demanded by the situation. The improviser may be called upon to play a character of a different age or sex. Character motivations are an important part of successful improv scenes, and improvisers must therefore attempt to act according to the objectives that they believe their character seeks.
Many theatre troupes are devoted to staging improvisational performances and growing the improv community through their training centres. Many of these Improv groups around the world can be found here.
In addition to for-profit theatre troupes, there are many college-based improv groups in the United States and around the world.
In Europe the special contribution to the theatre of the abstract, the surreal, the irrational and the subconscious have been part of the stage tradition for centuries. From the 1990s onwards a growing number of European Improv groups have been set up specifically to explore the possibilities offered by the use of the abstract in improvised performance, including dance, movement, sound, music, mask work, lighting, and so on. These groups are not especially interested in comedy, either as a technique or as an effect, but rather in expanding the improv genre so as to incorporate techniques and approaches that have long been a legitimate part of European theatre.
Notable contributors to the field 
Some key figures in the development of improvisational theatre are Viola Spolin and her son Paul Sills, founder of Chicago's famed Second City troupe and originator of Theater Games, and Del Close, founder of ImprovOlympic (along with Charna Halpern) and creator of a popular longform improv format known as The Harold. Other luminaries include Keith Johnstone, the British teacher and writer–author of Impro, who founded the Theatre Machine and whose teachings form the foundation of the popular shortform Theatresports format, Dick Chudnow, founder of ComedySportz which evolved its family-friendly show format from Johnstone's Theatersports, Stan Wells, creator of the "Clap-In" longform style and founder of The Empty Stage Comedy Theatre in Los Angeles, and Bill Johnson, creator/director of The Magic Meathands, who pioneered the concept of "Commun-edy Outreach" by tailoring performances to non-traditional audiences, such as the homeless and foster children.
David Shepherd, with Paul Sills, founded The Compass Players in Chicago. Shepherd was intent on developing a true "people's Theatre", and hoped to bring political drama to the stockyards. The Compass went on to play in numerous forms and companies, in a number of cities including NY and Hyannis, after the founding of The Second City. A number of Compass members were also founding members of The Second City. In the 1970s, Shepherd began experimenting with group-created videos. He is the author of "That Movie In Your Head", about these efforts.In the 1970s, David Shepherd and Howard Jerome created the Improvisational Olympics, a format for competition based improv. The Improv Olympics were first demonstrated at Toronto's Homemade Theatre in 1976 and have been continued on as the Canadian Improv Games. In the United States, the Improv Olympics were later produced by Charna Halpern under the name "ImprovOlympic" and now as "IO"; IO operates training centers and theaters in Chicago and Los Angeles. At IO, Halpern combined Shepherd's "Time Dash" game with Del Close's "Harold" game; the revised format for the Harold became the fundamental structure for the development of modern "long-form" improvisation.
Spaghetti Jam in San Francisco (1976–83) hosted weekly jam sessions that included Betty Thomas, Terry McGovern, John Elk, Buzz Belmondo, Robin Williams, Barry Sobel, Dana Carvey, Gil Christner, Joyce Imbesi, Taylor Negron, Jose Simon and Paul Willson.
The Groundlings is a popular and influential improv theatre and training center in Los Angeles, California. Gary Austin, founder of The Groundlings, continues to teach improvisation around the country, focusing especially in Los Angeles. He is widely acclaimed as one of the greatest acting teachers in America. His work is grounded in the lessons he learned as an improviser at The Committee with Del Close, as well as in his experiences as founding director of The Groudlings. The Groundlings is often seen as the Los Angeles training ground for the "second generation" of improv luminaries and troupes. Stan Wells developed the "Clap-In" style of longform improvisation here, later using this as the basis for his own theatre, The Empty Stage which in turn bred multiple troupes utilizing this style.
In the late 1990s, Matt Besser, Amy Poehler, Ian Roberts, and Matt Walsh founded the Upright Citizens Brigade Theatre in New York and later they founded one in Los Angeles, each with an accompanying improv/sketch comedy school. In September 2011 the UCB opened a third theatre in New York City's East Village, known as UCBeast.
See also 
- Ad lib
- Atellan Farce
- Commedia dell'arte
- Guerrilla theater
- List of improvisational theatre companies
- List of improvisational theater festivals
- Thank God You're Here
- Whose Line Is It Anyway?
- Twentieth Century Acting Training. ed. Alison Hodge. New York: Routledge, 2001.
- The story of the Compass Players and its development into The Second City is told by first-hand interviews in Jeffrey Sweet's book "Something Wonderful Right Away" (Limelight Editions, 2004)
- Janet Coleman's "The Compass: The Improvisational Theatre that Revolutionized American Comedy" (Centennial Publications of The University of Chicago Press, 1991).
- Viola Spolin (1999). Improvisation for the Theater Third Edition. ISBN 0-8101-4008-X.
- Experimental Theatre from Stanislavsky to Peter Brook by James Roose Evans
- Stephen Colbert 2006 Commencement Address at Knox College Transcript
- Eberhard Scheiffele
- Acting: an altered state of consciousness
- The Psychology of Consciousness'
- An account of this process which lead up to the development of modern longform improvisation, as seen through first-person accounts of Shepherd and Halpern, can be found in the documentary film "David Shepherd: A Lifetime in Improvisational Theatre", a 2010 film by Mike Fly. See http://www.themikefly.com/DAVID_SHEPHERD_A_LIFETIME_OF_IMPROVISATIONAL_THEATRE/HOME.html
- Povinelli, Daniel J. "On the possibilities of detecting intentions prior to understanding them". In B. Malle, D. Baldwin, & L. Moses (eds.), Intentions and Intentionality: Foundations of Social Cognition. MIT Press 2001.
Further reading 
- John Abbott. 2007. The Improvisation Book. London: Nick Hern Books. ISBN 978-1-85459-961-2.
- Coleman, Janet. 1991. The Compass: The Improvisational Theatre that Revolutionized American Comedy. Chicago: University Of Chicago Press.
- Ben Hauck. 2012. Long-Form Improv: The Complete Guide to Creating Characters, Sustaining Scenes, and Performing Extraordinary Harolds. New York: Allworth Press, 2012. ISBN 1581159811.
- Johnstone, Keith. 1981. Impro: Improvisation and the Theatre Rev. ed. London: Methuen, 2007. ISBN 0-7136-8701-0.
- Patricia Ryan Madson. 2005. "Improv Wisdom: Don't Prepare, Just Show Up" New York: Bell Tower. ISBN 1-4000-8188-2
- Nachmanovitch, Stephen. 1990. Free Play: Improvisation in Life and Art New York: Penguin-Tarcher. ISBN 0-87477-631-7.
- Spolin, Viola. 1967. Improvisation for the Theater. Third rev. ed. Evanston, Il.: Northwestern University Press, 1999. ISBN 0-8101-4008-X.
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- How To Be A Better Improviser, an essay by Dan Goldstein that lays out a foundation for improvising.
- Improvisation: the Original Survival Tool, an essay by Brad Fortier linking evolution of humanity with ethics of improvisation.