Project Schedule in Primavera P6

Ideally, the project should progress as per plan. Predecessor activities should be completed before their successor activities but sometimes it doesn't happen that way and out-of-sequence progress is observed. It happens because some successor activities are not truly fully dependent on their predecessor activities and weak relationships exist between such activities. Let us say we have a project with Activities A, B, C & D, all linked together by finish-to-start relationships. Activity A started and completed as planned but Activity C started out-of-sequence instead of Activity B. Primavera P6 gives three options to depict its effect on balance activities. To [...]