Activities not on the critical path are those with positive float, meaning they can be delayed without affecting the overall project completion time. The determination of such activities requires performing a forward and backward pass calculation as per CPM (Critical Path Method) analysis principles (PSP Study Guide, Section
2.2.4, "Relationships").
For example:
* Identify the critical path by analyzing total float values (typically, critical path activities have zero total float).
* Exclude activities that do not fall on the critical path.