Professional learning guide
Project Schedule Management Guide
Build defensible schedules using activity logic, calendars, uncertainty, critical-path analysis, float, and controlled recovery options.
Core concepts
Build the mental model first
- Dependency logic
- The relationships that determine when activities may start or finish.
- Critical path
- The network path currently determining the earliest project completion date.
- Total float
- Time an activity may move without delaying the project finish or governing constraint.
- Near-critical path
- A path with little float that may become critical as progress and risk conditions change.
Formula reference
Calculate—and understand what direction means
| Measure | Formula | Interpretation |
|---|---|---|
| PERT duration | (O + 4M + P) ÷ 6 | Expected duration using weighted three-point estimates. |
| PERT deviation | (P − O) ÷ 6 | Estimate uncertainty for one activity. |
| Total float | LS − ES or LF − EF | Schedule flexibility under the current logic. |
Worked reasoning
Recovering a regulatory milestone
Situation
The current forecast is ten working days late and two paths are nearly critical.
Manager’s approach
Validate logic and calendars, protect near-critical interfaces, then compare crashing selected activities with fast-tracking work that can safely overlap.
Takeaway
Compression should be targeted at work affecting the controlling path; accelerating noncritical work may add cost without changing the milestone.
PMP lens
What to remember in scenario questions
- Crashing usually adds cost or resources.
- Fast-tracking increases risk by overlapping work.
- Resource leveling can change the critical path.
- Float belongs to the integrated schedule, not one task owner.
Common doubts
Questions learners ask
Is the critical path always the longest path?
It is the longest-duration path through the current network logic and therefore controls the earliest finish.
Can a project have multiple critical paths?
Yes. Multiple or converging critical paths increase schedule risk.
Does zero float always mean poor planning?
No. It identifies work with no schedule flexibility under the current model and constraints.
Practice tools
Apply schedule & estimating concepts
Critical Path Calculator
Find the dependency path that determines project duration.
Open calculator →PERT Calculator
Create an uncertainty-aware duration estimate.
Open calculator →Three-Point Estimate
Compare PERT and triangular estimates.
Open calculator →Float Time
Calculate schedule flexibility and critical activities.
Open calculator →Float / Slack Analysis
Review total and free float across activities.
Open calculator →Schedule Variance
Compare earned value with planned value.
Open calculator →Schedule Compression
Evaluate crashing and fast-tracking trade-offs.
Open calculator →Working Days
Convert calendar dates into realistic working time.
Open calculator →