Chapter 12. DECISION RULES AND EXPRESSIONS. 12.1 Introduction. Decision rules often are represented in one of two formats Procedures Production rules. 12.2 PROCEDURAL KNOWLEDGE. Two key features characterize this representation
FIGURE 12-2 Decision rule represented as production rules. This collection of production rules represents the same knowledge as the decision tree in Figure 12-1. Each rule associates a Boolean condition that evaluates to true or false with an action (in this case, a diagnosis). The terms “erythema,”“pus,” and “adenopathy” are Boolean variables that evaluate to true or false based on data available to the CDSS.