Decision tables are one of the basic techniques used in solving problems and decision making. Using decision table one can in a concise way specify, under predetermined conditions, what actions should be taken. Decision table is a specific way of describing a set of related decision rules.
Structure of decision table
Each table is divided into four main fields (S. Wrycza 1996, s. 120-121):
- Conditions - formulation of the necessary conditions in the process of deciding, the definition of variables affecting the decision process,
- Actions - decisions, listing all the possible actions that can be executed on the assumption that specific combination of conditions contained in the first field of the array occurred,
- Selection criteria - there are presented all the states of individual conditions, indicators, values, Symbol placed in this field indicates whether the condition has been fulfilled or not (usually used symbols: "1" condition fulfilled, "0" condition is not met, "-" the condition is not significant).
- Action selection - contains symbols identifying that particular action should be performed (used symbols "X" - action should be taken, "-" actions should not be taken)
- Wang, G. Y., Yu, H., & Yang, D. C. (2002). Decision table reduction based on conditional information entropy. CHINESE JOURNAL OF COMPUTERS-CHINESE EDITION-, 25(7), 759-766.
Author: Krzysztof Wozniak