Final answer:
In the context of PDM for a sequential mandatory dependency, the Finish-to-Start (FS) dependency is commonly used to indicate that one task must be completed before the next task can begin.
Step-by-step explanation:
When considering a sequential mandatory dependency in project management, particularly within the framework of Precedence Diagramming Method (PDM), you would typically use a Finish-to-Start (FS) dependency. This is because FS is the most common type of dependency relationship used to signify that a particular task cannot start until a preceding task has finished, which is essential in processes where certain tasks are mandatorily required to be completed before subsequent tasks can commence.
For example, in a construction project, the foundation must be completed (finish) before the framing of the structure can begin (start). This clear sequencing is necessary to ensure that activities are executed in the correct order, respecting physical or legal constraints that dictate the progression of tasks.
Another example could be in a construction project, where the foundation must be finished before the walls can be built. Here, the foundation activity has to be completed before the wall activity can start.