If you write documentation, then try a decision table

A decision table is a powerful documentation tool based on a simple principle: sets of responses for sets of conditions. It is used to present a large quantity of complex information in a simple, straightforward manner. Since the decision table requires no special symbols or shapes, it is understood by nonprogrammers and programmers alike. It can thus serve as a common denominator for a project team, a quick-reference card, and a step-by-step procedural guide. The author argues that if time is invested in explaining how to use a decision table then both the writer and the user will profit from a valuable documentation tool.