How do you define and manage lag and lead time in dependency-driven scheduling

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When you’re setting up schedules with task dependencies, how do you usually define and manage lag and lead time so the plan stays realistic?
Apr 14 in PMP by Parshvi
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1 answer to this question.

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Lag and lead are time differences between dependent tasks that affect their start and end relationships. They are used to model real-world timing restrictions in scheduling logic.

  • Lag Time – The delay between dependent tasks

    • Added when there is a required gap following a predecessor job

    • Example: FS+2 signifies successor starts 2 days after predecessor stops

    • Frequently used in building, manufacturing, and phased processes

  • Lead Time – Acceleration or overlap between tasks

    • Allows a successor to begin before the predecessor ends

    • For example, FS-3 indicates that the successor begins three days before the predecessor finishes

    • Effective for Agile, design-development overlaps, or content-approval loops

  • Managing Lag and Leading in Scheduling Tools

    • In tools like MS Project, Primavera, and Smartsheet, add lag/lead using dependency fields

    • Clearly define the rationale for lag/lead in WBS notes or task descriptions

    • Use these cautiously, as large or arbitrary leads/lags diminish schedule clarity and flexibility

Lead and lag help model realistic time gaps or overlaps and should be applied deliberately.

answered Apr 14 by Naira

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