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).

[edit] Related articles on Designing Buildings Wiki

• Acceleration.
• Activity.
• Critical path.
• Extension of time.
• Finish-start logic
• Fuzzy logic.
• Hanging activity.
• Lead time.
• Level of effort.
• Programme float.
• Programme.
• Progress of construction works.
• Scheduling construction activities.
• Start-finish logic.
• Start-start logic