CAPM Practice: Demonstrate an understanding of a project management plan schedule

Finish-to-Start (FS) is the most common dependency type. It means the successor activity (B) cannot begin until the predecessor activity (A) is complete. For example, concrete cannot be poured (B) until formwork is built (A). This logical relationship defines the sequencing constraint between activities.

**Why not A:** Activity B starting at the same time as Activity A describes a Start-to-Start (SS) dependency, not a Finish-to-Start dependency. In SS, both activities can begin simultaneously, whereas FS requires the predecessor to finish first.

**Why not C:** Both activities finishing at the same time describes a Finish-to-Finish (FF) dependency. In FF, the successor cannot finish until the predecessor finishes, which is a different logical relationship than FS.

**Why not D:** Activity B finishing before Activity A can start describes the reverse of a Finish-to-Start relationship. This would mean B is the predecessor and A is the successor, which inverts the dependency direction described in the question.