Finish to start lags are the same as additional activity slack.

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Finish to start lags are specific delays inserted between the finish of one activity and the start of another, dictating a waiting period before the successor activity can begin. Additional activity slack, however, refers to the amount of time an activity can be delayed without affecting the project's overall completion time, which is not necessarily related to a deliberate delay between activities.

Finish to Start Lags Are the Same as Additional Activity