Consider the following decision table:This decision table has been created to test the following specification:...

A decision table is collapsed when duplicate or impossible cases are removed. In this decision table, there are two duplicate cases: column 2 and column 4 have the same actions (A1 and A2), and column 5 and column 6 have the same action (A1). There are also two impossible cases: column 7 and column 8 have no actions, which means that there is no outcome for these combinations of conditions. Therefore, after collapsing the decision table, only two cases are left: column 1 and column 3, which have different actions (A1 and A2 for column 1, and A1 for column 3). References =

ISTQB Certified Tester Advanced Level Syllabus Technical Test Analyst1, page 2

Decision Table-Based Testing2, section “Don’t Care Entries and Rule Counts”

A Guide on Building Decision Tables3, section “How to ensure that the Table is Complete?”