For calculating LF for each event: - Start from the end and move to the left - Any activity (arrow) going to the end event (circle) equals to the CP - Any other activity (arrow) must be the CP minus the sum of longest successor activities For calculating LF for each event: - Start from the end and move to the left - Any activity (arrow) going to the end event (circle) equals to the CP - Any other activity (arrow) must be the CP minus the sum of longest successor activities