IBIS
From Faster Than 20
IBIS stands for "Issue-Based Information System." It's a grammar developed by Werner Kunz and Horst Rittel to help develop a shared understanding of wicked problems.
At its core, the grammar consists of four types:
- Questions (or Issues)
- Ideas
- Pros
- Cons
Jeff Conklin invented a graphical depiction of this grammar (gIBIS) which serves as the core of Dialogue Mapping.