Back to Cpm Pert And S Curve Training Module repository
Cpm Pert And S Curve Training Module2D

Module 2: CPM Fundamentals and Critical Path Scheduling - Cpm Pert Scurve Training Module02 Backward Pass

Network logic, activity sequencing, forward pass, backward pass, float analysis, and critical path control for construction management.

Open the complete lesson

Interactive Backward Pass Visualizer

Step backwards through the network to calculate late schedules, floats, and identify critical paths.

Activity Durations
A: Site Prep3 days
B: Excavation5 days
C: Formwork4 days
D: Concreting2 days
Step 0 of 4: Explanation (Backward Flow)

The forward pass is already calculated. Now we begin the backward pass from the final activity D. The initial project duration is 10 days.

A: Site Prep (Dur: 3, TF: 0)0d=33A: Site Prep?TF:??B: Excavation (Dur: 5, TF: 0)3d=58B: Excavation?TF:??C: Formwork (Dur: 4, TF: 1)3d=47C: Formwork?TF:??D: Concreting (Dur: 2, TF: 0)8d=210D: Concreting?TF:??
CPM Node Standard Layout (Full 3-Row Block)

Top row shows forward pass early dates (ES, EF). Bottom row shows backward pass late dates (LS, LF) and Total Float (TF).

ESDurEFActivity IDLSTFLF