General · Networks · project scheduling

Find the critical path

Step through the network: earliest times forward, latest times backward — zero float pins the critical path.

Press Next step — each click writes one EST or LST and explains why.

Project duration: — days · critical path: —

Network

Scan

Ready — press Next to start the forward scan.

Show EST / LST on all events
keep times on every node once they are known

One event at a time. The table fills as each EST/LST is written — read the why line under the network.

Working

Activities with zero float lie on the critical path — delay any one of them and the whole project finishes later.