The tools in STEM^TM are the application of techniques of STEM^TM in the test lifecycle. These are applied to evolve test strategy, estimate effort, design test cases, assess regression, and ensure completeness.

• Goal-oriented strategy: Understand the goal of what types of defects to uncover and then evolve the cost-effective strategy using the EFF technique.



• Hierarchical test design: Design test scenarios and then cases in a hierarchical manner using the BEST approach.



• Risk based planning: Come with the test plan based on the factors that are critical to quality.



• Fault catalog: Use history of previous faults to look for faults in the current software.



• Requirement traceability: Traces scenarios/cases to features to ensure completeness.



• Interaction matrix: Understand the degree of interaction of features to evolve cost-effective regression strategy.