Modify System
During this activity, the performance tester works with the technical stakeholders to tune the system by making modifications to it. These modifications are made based on the analysis of the results of all previous test executions. These modifications must be made using a scientific approach (i.e. make one change at a time, then evaluate the effects of that change before making further changes). Typically the developers and administrators of the system physically make the modifications based on the performance testers observations and suggestions.