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There’s no restriction on when test sessions are added. It’s not uncommon for sessions to be created while the feature is being planned and developed and tested. Sessions can also be renamed or deleted as needed. If you have pre-written tests they can be run during a session, but because test sessions emphasize test objectives over specific test cases, testers are also encouraged to devize devise and run any additional tests that they feel will help meet the test objective. Creating and executing more tests based on what you discover and learn while testing is an approach called exploratory testing. It’s an extremely powerful way of optimizing test coverage without incurring the costs associated with writing and maintaining test cases.

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