# REL 8  How do you implement change?
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Controlled changes are necessary to deploy new functionality, and to ensure that the workloads and the operating environment are running known software and can be patched or replaced in a predictable manner. If these changes are uncontrolled, then it makes it difficult to predict the effect of these changes, or to address issues that arise because of them. 

**Topics**
+ [REL08-BP01 Use runbooks for standard activities such as deployment](rel_tracking_change_management_planned_changemgmt.md)
+ [REL08-BP02 Integrate functional testing as part of your deployment](rel_tracking_change_management_functional_testing.md)
+ [REL08-BP03 Integrate resiliency testing as part of your deployment](rel_tracking_change_management_resiliency_testing.md)
+ [REL08-BP04 Deploy using immutable infrastructure](rel_tracking_change_management_immutable_infrastructure.md)
+ [REL08-BP05 Deploy changes with automation](rel_tracking_change_management_automated_changemgmt.md)