CAPM Practice: Demonstrate an understanding of a project management plan schedule

The forward pass works from left to right (project start to end) through the network to calculate the Early Start (ES) and Early Finish (EF) for each activity. The backward pass works from right to left (end to start) to calculate Late Start (LS) and Late Finish (LF). Float is then derived: Total Float = LS - ES (or LF - EF).

**Why not A:** Late start and late finish dates are calculated by the backward pass, which works from the project end date back to the start. The forward pass moves in the opposite direction — from start to finish — calculating the earliest possible dates.

**Why not B:** Total float is derived by comparing the results of both the forward pass and backward pass (Total Float = LS - ES or LF - EF). It cannot be calculated from the forward pass alone; both passes must be completed first.

**Why not D:** The backward pass works from the end to the start, not the forward pass. Additionally, while the forward pass determines the project duration by reaching the end date, it works forward from the beginning, not backward from the end.