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Lag

A planned waiting period that delays the start or finish of a successor activity relative to its predecessor in a dependency link.

Key Points

  • Lag is a delay applied to the relationship between activities (FS, SS, FF, SF), not to the activities themselves.
  • It is usually a positive duration that postpones the successor; a negative value would represent a lead (accelerating the successor).
  • It models non-work waiting time such as curing, drying, shipping, or approval wait periods.
  • Defined in the schedule network as a duration or time unit on the dependency link and does not consume resources.

Example

Activity A: Pour concrete. Activity B: Strip forms. The relationship is Finish-to-Start with a 2-day lag to allow the concrete to cure. B cannot start until 2 days after A finishes.

PMP Example Question

A schedule shows Activity B cannot start until three days after Activity A finishes, even though A is complete. What is this three-day period called?

  1. Lead
  2. Float
  3. Lag
  4. Management reserve

Correct Answer: C — a planned delay between a predecessor and its successor

Explanation: Lag is the intentional waiting time inserted on a dependency link; lead accelerates the successor, float is schedule flexibility, and reserves are contingency buffers.

ICS/OT Cybersecurity Fundamentals — Security Built for Industrial Systems

Industrial control systems cannot be secured like ordinary IT. A forced reboot, aggressive scan, or incompatible patch can interrupt production and create real safety consequences. Effective OT security begins with understanding the systems, constraints, and risks unique to industrial environments.

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