What are the schedule constraints?

A common mistake in project control is applying constraints to too many activities. Constraints should be reserved for contractual milestones tied to liquidated damages, not routine tasks like crane dismantling or tile deliveries.

Why? Because constraints directly influence negative float, which signals project delay. Misusing them can create false alarms, showing delays where none exist.

For example, late tile delivery may not be critical if the activity has positive float, yet a constraint would incorrectly flag the entire project as behind schedule.

The right approach is:

Apply constraints only to milestones that are tied to liquidated damages.

Always check whether negative float results from an actual delay or from misapplied constraints.

Bottom line: constraints are powerful tools, but only when applied with precision.

Used correctly, they highlight real risks and protect against penalties.

Used carelessly, they distort the schedule and mislead project teams.