Health-insurance claims adjudication case study (500k claims/month, 120+ interacting business rules) where per-stage decision tables cut eligibility testing from 64 theoretical combinations to 12 unique scenarios by collapsing impossible and redundant columns.
Practitioner deep-dive on turning business rules (pricing, insurance checks, approval logic) into decision tables whose columns become test cases, including checksum-style verification of collapsed rules with don't-care values and measuring column coverage.
Worked example from an insurance policy-renewal project showing how a 10-condition, 2-outcome decision table turned four renewal-underwriting requirements (auto vs manual underwriting across Traditional and Digital channels) into 11 scenarios for developers and testers.
Experience-based workshop playbook that captures a domain expert's 'it depends' business rules as a decision-table grid with don't-cares and a named hit policy, walking out with one test case per column and a list of policy gaps the expert could not answer.
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