BABOK_Guide_v3_member_copy

Decision Modelling
Techniques
All of these approaches involve three key elements:
• decision,
• information, and
•knowledge.
Decision Tables
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Business decisions use a specific set of input values to determine a particular
outcome by using a defined set of business rules to select one from the available
outcomes. A decision table is a compact, tabular representation of a set of these
rules. Each row (or column) is a rule and each column (or row) represents one of
the conditions of that rule. When all the conditions in a particular rule evaluate to
true for a set of input data, the outcome or action specified for that rule is
selected.
Decision tables generally contain one or more condition columns that map to
specific data elements, as well as one or more action or outcome columns. Each
row can contain a specific condition in each condition column. These are
evaluated against the value of the data element being considered. If all the cells in
a rule are either blank or evaluate to true, the rule is true and the result specified
in the action or outcome column occurs.
Figure 10.17.1: Decision Table
Eligibility Rules
Loan Amount
2000
Age
Eligibility
>18 Eligible
21 Eligible
=25 Eligible