Horst Willhelm Jakob Rittel (* 14 July 1930 in Berlin, † 9 July 1990 in Heidelberg) was a design theorist and university professor. He is best known for coining the term wicked problem, but his influence on design theory and practice was much wider.
His field of work is the Science of Design, or, as it also known, the area of Design Theories and Methods (DTM), with the understanding that activities like planning, engineering, policy making are included as particular forms of design.
In response to the perceived failures of early attempts at systematic design, he introduced the concept of 'second generation design methods' and a planning/design method known as Issue-Based Information System (IBIS) for handling wicked problems.
IBIS (for 'Issue-Based Information System') is the instrumental version of the understanding of design as argumentation. It is a method to guide the design process and to reinforce deliberation and argumentation. A number of computer-based versions of IBIS have been and are being developed for various computer systems (personal computers and workstations).
The idea of IBIS was conceived in 1968. It has served as a regular teaching tool, in order to demonstrate the typical difficulties of design and the different ways of dealing with them. IBIS was an idea "waiting for an appropriate technology" in order to become more effective and attractive. The various previous applications have been more or less successful, but have suffered from bureaucratic clumsiness. The recent availability of "hypertext" data-structures and user interfaces - even on small microcomputers and moderately priced workstations - has allowed the design of IBISes which are much more "user-friendly" than their predecessors. Today, we have a number of IBIS-programs, developed and implemented on a variety of machines by PhD-students, most recently by Ph.D. candidate Douglas Noble. In addition, there is an implementation ('gIbis'), developed by MCC (an R&D - corporation in Austin TX, run by a consortium of 25 leading US-computer companies).
There are considerations to make the concept of IBIS the basis of operating systems for future generations of computers. At present, large scale tests of gIBIS as a tool for supporting hard- and software development are under way in several corporations. The use of IBIS as a management tool and as a means for argumentative treatment of technology assessment is also being considered by several companies in Europe and elsewhere.
Some crucial old weaknesses of IBIS remain the same: the danger of getting lost in the web of cross-references, the lack of a 'synoptic' overview of the state of resolution, and the 'logic of the next question", i.e. the problem of prestructuring the possibilities for guiding the designers' deliberations into plausible directions.
- 1958 — 1963 Professor of Design Methodology at the Ulm School of Design in Germany (Hochschule für Gestaltung - HfG Ulm).
- 1963 — 1990 Professor of the Science of Design at the University of California, Berkeley, College for Environmental Design, Department of Architecture and Department of City and Regional Planning
- 1967 Visiting Associate Professor for Architecture and Operations Research at Washington University, St. Louis, Missouri
- 1973 — 1990 Director and Professor at the University of Stuttgart, Faculty for Architecture and Town Planning.
See also 
- Churchman, C. W. (1967). Wicked problems. Management Science, 14(4), B-141 and B-142.
- Rith, C and Dubberly, H, 'Why Horst W J Rittel Matters', Design Issues, Vol 23, No 1, pp. 72-91
- Rittel, H., 1984, "Second-Generation Design Methods", in "Developments in Design Methodology", N. Cross (Editor), John Wiley & Sons, UK pp. 317-327.
- Rittel, Horst W.J., Annual Report of Faculty Achievement, UC Berkeley. 1988. These paragraphs on IBIS were written in first person by Horst Rittel and adapted to third-person narrative by the Wikipedia contributor.
- Ulm School of Design | HfG Ulm Archive
- Lindinger, H., (1991), Ulm Design: The Morality of Objects, Cambridge: The MIT Press.