Task B is not planned to start until Task A is completed. Task A is delayed and will not be completed on time. Starting Task B prior to Task A completing is an example of:

Managing change involves formally documenting, assessing, and approving modifications to project baselines (scope, schedule, cost), which is a broader process than adjusting task dependencies.

Fast tracking is a schedule compression technique that involves performing activities or phases in parallel or partially in parallel that would normally be done in sequence. This approach aims to shorten the overall project duration by overlapping dependent tasks.

Rolling wave planning is an iterative planning approach where near-term work is planned in detail while future work is planned at a higher level, not a technique for overlapping delayed tasks.

Crashing is a schedule compression technique that involves adding resources to an activity to shorten its duration, often at an increased cost, which is different from overlapping tasks.