In CPM scheduling, which relationship type is most commonly used and represents a finish-to-start dependency?
Correct Answer
D) FS (Finish-to-Start)
Finish-to-Start (FS) is the most common dependency relationship in CPM scheduling, where one activity must finish before the successor activity can start. This represents the typical sequential workflow in construction.
Why This Is the Correct Answer
Finish-to-Start (FS) is indeed the most commonly used dependency relationship in CPM scheduling, representing approximately 80-90% of all project relationships. This relationship type reflects the natural sequential flow of construction activities where one task must be completed before the next can begin. For example, concrete must be poured and cured before framing can start, or electrical rough-in must be finished before drywall installation can commence. This logical progression makes FS the default and most intuitive relationship type in construction project management.
Why the Other Options Are Wrong
Option B: SF (Start-to-Finish)
Start-to-Finish (SF) is the rarest dependency type in construction scheduling and is seldom used in practice. This relationship means an activity cannot finish until another activity starts, which goes against typical construction logic and workflow patterns.
Option C: SS (Start-to-Start)
Finish-to-Finish (FF) relationships are the least common type, used when two activities must finish around the same time or one activity's completion depends on another's completion. An example would be final cleanup finishing when final inspection is completed, but this represents a small percentage of construction relationships.
Memory Technique
Remember 'FS First' - Finish-to-Start is First in frequency. Also think 'Finish before Start' as the natural construction flow: finish the foundation before starting the framing, finish framing before starting roofing.
Reference Hint
Look up CPM scheduling fundamentals in Chapter 6 (Project Scheduling) of construction management references, or the scheduling section of project management guides that cover the four dependency types and their applications.
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