Mind Tools - Management Training, Leadership Training and Career Training. Free Critical Path Method (CPM) Spreadsheet - PERT Algorithm. The Critical Path Method (CPM) provides a way for project managers to determine which tasks are critical (zero slack time) and which tasks can be delayed (and for how long).
Normally, you'd need specialized software such as MS Project. Not any more. Free Critical Path Method (CPM) Spreadsheet - PERT Algorithm. GanttProject Home.