The latest time an activity can finish without delaying the project.

The latest time an activity can finish without delaying the project.

• A. Latest Finish (LF)
• B. Earliest Finish (EF)
• C. Earliest Start (ES)
• D. Latest Start (LS)

Answer: (A)

The concept being tested is the latest moment an activity can end without delaying the overall project. This value, called the Latest Finish, marks the deadline for finishing the activity so that the project’s finish date remains unchanged. If the activity ends at or before this time, the project is safe; finishing after it would push the project finish out. Understanding how it fits with other timings helps: the earliest finish is the soonest possible completion given the constraints; the earliest start is the soonest the activity can begin; the latest start is the latest it can begin without delaying the project, which equals the Latest Finish minus the activity’s duration (LS = LF − duration). On the critical path, the Latest Finish equals the Earliest Finish (zero slack). Since the question asks for the latest time an activity can finish without delaying the project, the correct concept is the Latest Finish.

The concept being tested is the latest moment an activity can end without delaying the overall project. This value, called the Latest Finish, marks the deadline for finishing the activity so that the project’s finish date remains unchanged. If the activity ends at or before this time, the project is safe; finishing after it would push the project finish out.

Understanding how it fits with other timings helps: the earliest finish is the soonest possible completion given the constraints; the earliest start is the soonest the activity can begin; the latest start is the latest it can begin without delaying the project, which equals the Latest Finish minus the activity’s duration (LS = LF − duration). On the critical path, the Latest Finish equals the Earliest Finish (zero slack). Since the question asks for the latest time an activity can finish without delaying the project, the correct concept is the Latest Finish.