# REL 12  How do you test reliability?
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After you have designed your workload to be resilient to the stresses of production, testing is the only way to ensure that it will operate as designed, and deliver the resiliency you expect.

**Topics**
+ [REL12-BP01 Use playbooks to investigate failures](rel_testing_resiliency_playbook_resiliency.md)
+ [REL12-BP02 Perform post-incident analysis](rel_testing_resiliency_rca_resiliency.md)
+ [REL12-BP03 Test functional requirements](rel_testing_resiliency_test_functional.md)
+ [REL12-BP04 Test scaling and performance requirements](rel_testing_resiliency_test_non_functional.md)
+ [REL12-BP05 Test resiliency using chaos engineering](rel_testing_resiliency_failure_injection_resiliency.md)
+ [REL12-BP06 Conduct game days regularly](rel_testing_resiliency_game_days_resiliency.md)