What is the default task constraint when adding tasks to a project planned from the completion date?

The default task constraint when adding tasks to a project that is planned from the completion date is "As late as possible." This constraint is designed to maximize flexibility in scheduling, allowing tasks to start as late as they can while still ensuring the overall project completion date is met. By allowing tasks to be scheduled to start later, it helps to accommodate any changes or delays that may occur without jeopardizing the project's end date.

In a project planned from the completion date, fitting in tasks in the most efficient manner is crucial. The "As late as possible" constraint naturally pushes tasks towards the end of the timeline, thereby preserving the flow of project work and potentially aligning with resource availability. This approach helps manage dependencies and can provide buffer time for tasks, thus leading to a smoother execution of the project.