In which of the following logical relationships can a successor activity not start until a predecessor activity has finished?

In project management, the finish-to-start relationship is a foundational concept in scheduling that indicates the sequencing of activities. In this relationship, a successor activity can only begin when the predecessor activity has completely finished. This sequential dependency ensures that the resources or outputs required by the successor are only available after the predecessor has completed its work.

For example, in a construction project, the task of "painting walls" (successor) cannot start until the task of "installing drywall" (predecessor) is fully completed. This relationship is critical for maintaining the flow of the project, as it protects against conflicts and inefficiencies that could arise if a successor activity were to start before the predecessor’s work was done.

While other relationships like start-to-start, finish-to-finish, and start-to-finish have their own unique dependencies, they do not require the predecessor activity to be entirely finished for the successor to commence, which differentiates them from finish-to-start.