Which statement about a constraint in scheduling is true?

• A. It is a restriction that limits schedule options.
• B. It is a logical relationship between tasks.
• C. It is an external risk event.
• D. It is a resource availability issue.

Answer: (A)

A constraint in scheduling is any condition that restricts when or how project activities can be performed, which narrows the feasible options for the schedule. That’s why the statement describing a constraint as a restriction that limits schedule options is the best fit. Constraints shape the timetable by fixing start or finish times, deadlines, calendars, or mandatory sequencing, so they directly limit what the schedule can look like. It’s different from a logical relationship between tasks, which governs the order of activities (dependencies), and from an external risk event, which is about potential future uncertainties. Resource availability can influence scheduling but isn’t the general idea of what a constraint is.