SOP: Review Critical Path the Right Way in Microsoft Project
🎯 Purpose
To identify the tasks that directly control the project finish date so you can focus on the work that matters most.
Important Rule:
If a Critical Task is delayed by 1 day, the entire project may be delayed by 1 day.
Step 1: Complete Your Schedule First
Before reviewing the Critical Path, make sure you have:
✅ Created all tasks
✅ Assigned durations
✅ Linked task relationships (FS, SS, FF, SF)
✅ Assigned resources
✅ Set project start date
Without a complete schedule, the Critical Path will not be accurate.
Step 2: Switch to Gantt Chart View
Open Microsoft Project.
Go to View tab.
Select Gantt Chart.
This is the easiest place to review Critical Tasks.
Step 3: Display the Critical Path
Method 1 (Recommended)
Go to Format tab.
Check Critical Tasks.
Microsoft Project will automatically highlight critical tasks.
Typical result:
Red bars = Critical Tasks
Blue bars = Non-Critical Tasks
Step 4: Check Total Slack
Critical tasks normally have:
Total Slack = 0 Days
To display it:
Right-click any column header.
Choose Insert Column.
Select Total Slack.
Example:
| Task | Total Slack |
|---|---|
| Excavation | 0d |
| Foundation | 0d |
| Column Work | 0d |
| Painting | 5d |
Interpretation:
0d = Critical
Greater than 0d = Non-Critical
Step 5: Apply Critical Filter
To see only critical tasks:
Go to View
Select Filter
Choose Critical
Now Microsoft Project shows only the tasks affecting project completion.
This is useful for weekly review meetings.
Step 6: Trace the Critical Chain
Review the critical tasks from start to finish.
Example:
Site Preparation
↓
Excavation
↓
Foundation
↓
Columns
↓
Beams
↓
Roof
↓
Finishing
↓
Project Completion
Ask:
Which task can delay the next task?
Which task has no float?
Which task is currently behind schedule?
Step 7: Review Progress Weekly
Every week:
Update Actual Start.
Update Actual Finish.
Update % Complete.
Recalculate schedule.
Then review:
Has the Critical Path changed?
Are new tasks becoming critical?
Is the project finish date moving?
Critical Path can change throughout the project.
Step 8: Focus Management Attention on Critical Tasks
For every Critical Task:
Check Resources
Enough workers?
Enough equipment?
Enough materials?
Check Risks
Weather risk?
Supplier delay?
Design approval delay?
Check Productivity
On schedule?
Behind schedule?
Need additional crew?
Common Mistakes
❌ Reviewing Critical Path before linking tasks
❌ Reviewing Critical Path before assigning durations
❌ Looking only at red bars without checking Total Slack
❌ Ignoring resource constraints
❌ Not updating progress regularly
❌ Assuming the Critical Path never changes
Construction Example
Suppose your house project has:
| Task | Duration |
|---|---|
| Excavation | 3d |
| Foundation | 5d |
| Columns | 4d |
| Roof | 5d |
| Painting | 6d |
After calculation:
Excavation = Critical
Foundation = Critical
Columns = Critical
Roof = Critical
Painting = Non-Critical (3 days slack)
If Painting is delayed by 2 days:
✅ Project finish date stays the same.
If Foundation is delayed by 2 days:
❌ Project finish date moves 2 days later.
Best Practice for a General Contractor (GC)
For your 8AM construction projects:
Daily
Review today's critical tasks.
Weekly
Apply the Critical filter.
Review all critical activities with the team.
Monthly
Compare current Critical Path against the baseline schedule.
Always Remember
"The Critical Path is the fastest route to project completion. Protect it every day."
When managing a construction project, spend 80% of your attention on Critical Tasks and 20% on Non-Critical Tasks because critical tasks determine whether the project finishes on time.