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Lead and lag are important concepts in project scheduling that influence the timing of activities. Understanding how they work helps in creating realistic schedules and avoiding delays. This article explains these concepts with practical examples.
What Are Lead and Lag?
Lead refers to the overlap between two activities, allowing one task to start before the previous one finishes. Lag is the delay between the completion of one activity and the start of the next. Both are used to adjust schedules for efficiency and resource management.
Practical Examples of Lead
Suppose a construction project involves pouring concrete and then installing flooring. If flooring can begin before the concrete fully cures, a lead time is applied. For example, starting flooring 2 days before the concrete cure completes accelerates the schedule.
Practical Examples of Lag
In a software development project, testing might need to wait for code completion. If testing starts 3 days after coding finishes, a lag of 3 days is incorporated. This ensures the testing phase begins at the appropriate time without rushing.
Using Lead and Lag Effectively
Proper application of lead and lag improves project flow and resource utilization. Overusing lead can cause coordination issues, while excessive lag may extend the project timeline. Balancing these elements is essential for realistic scheduling.