Last edited 21 Mar 2019

Logic link

Logic links describe the relationships between one activity and another.

Common types of logic link include:

  • Finish-to-start: One activity cannot start until a previous activity has finished.
  • Lagged finish-to-start: One activity cannot start until a specific amount of time after a previous activity has finished.
  • Start-to-start: One activity cannot start until another activity has started.
  • Lagged start-to-start: One activity cannot start until a specific amount of time after another activity has started.
  • Finish-to-finish: One activity cannot finish until another activity has finished.
  • Lagged finish-to-finish: One activity cannot finish until a specific amount of time after another activity has finished.
  • Lagged start and finish: One activity cannot start until a specific amount of time after another activity has started, and it cannot finish until a specific amount of time after that activity has finished.
  • Negative lag: One activity can start a specific amount of time before another activity has been completed.
  • Must start / must finish. The activity must start or finish on a specific date.

Ref The Society of Construction Law Delay and Disruption Protocol, 2nd edition, published in February 2017 by the Society of Construction Law (UK).

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