Understanding Task Predecessors: | SiteBook Help Center

Table of contents Understanding Task Predecessors:

Understanding Task Predecessors:

Task Predecessors: The 5 Key Types Explained

Updated over 2 months ago Table of contents

1. Start to Start (SS)

**Task B can only start after Task A has started.**

Example: Carpentry Labour (Task A) must start before Windows Install (Task B) can start.

2. Finish to Finish (FF)

**Task B can only finish after Task A is finished.**

Example: Waterproofing (Task A) must finish before Tiling (Task B) can finish.

3. Start to Finish (SF)

**Task B can only finish after Task A has started.**

Example: Remove Scaffolding (Task B) can only finish after the Roof Install (Task A) has started.

4. Lag - Finish to Start (-1)

**Task B can start 1 time unit before Task A is finished.**

Example: Trench Inspection (Task B) can start 1 day before Slab Pour (Task A) is completely finished.

5. Lag - Finish to Start (+1)

**Task B can only start 1 time unit after Task A is finished.**

Example: Carpentry Labour (Task B) can start 1 Day after Timber Delivery (Task A) is finished.

Example:

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