Test cases are designed during
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Test recording
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Test planning
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Test configuration
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Test specification
Test cases are designed during test specification, which is part of the test design phase where detailed test inputs and expected results are documented. Test planning happens earlier and focuses on strategy, scope, and resources. Test recording is about logging results, and test configuration involves setting up the test environment.
Test cases are designed during Test Specification (also called test design), the phase where testers translate test conditions/objectives from the test plan into concrete test cases with specific inputs, steps, and expected results. Test Planning happens earlier and defines scope, strategy, resources, and schedule — not the individual test case details. Test Recording refers to capturing results/logs during execution. Test Configuration is about setting up the test environment. So Test Specification is the correct ISTQB-aligned phase for actual test case design.