Project Scheduling and Critical Path Analysis Cheat Sheet

Updated 2026-03-19

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Project scheduling is the process of defining project activities, sequencing them logically, estimating durations, and developing a timeline that predicts when work will be performed and completed. It sits at the heart of project management, driving resource allocation, cost control, and stakeholder communication. The Critical Path Method (CPM) revolutionized this field by identifying the longest sequence of dependent tasks that determines the minimum project duration—any delay on this path delays the entire project. What makes modern scheduling powerful is not just finding the critical path, but understanding float, dependencies, and variance tracking to dynamically adapt as conditions change, turning static plans into living, decision-ready models.

What This Cheat Sheet Covers

This topic spans 24 focused tables and 130 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.

Table 1: Network Diagram TypesTable 2: Dependency TypesTable 3: Critical Path CalculationsTable 4: Float and Slack TypesTable 5: Duration Estimation MethodsTable 6: Schedule Compression TechniquesTable 7: Gantt Chart ElementsTable 8: Earned Value Schedule MetricsTable 9: Schedule Forecasting MetricsTable 10: Resource Optimization TechniquesTable 11: Constraint TypesTable 12: Critical Chain Project ManagementTable 13: Activity TypesTable 14: Schedule Baseline and ControlTable 15: Progress Update MethodsTable 16: Schedule Risk AnalysisTable 17: Work Breakdown and Activity DefinitionTable 18: Calendar and Time ConceptsTable 19: Advanced Scheduling TechniquesTable 20: Schedule Quality MetricsTable 21: Schedule Reserve and BuffersTable 22: Schedule Software and ToolsTable 23: Specialized Planning ApproachesTable 24: Duration vs. Effort vs. Elapsed Time

Table 1: Network Diagram Types

Method	Example	Description
Precedence Diagramming Method (PDM)	Boxes `A` `→` `B` `→` `C` with arrows between nodes	• Activities shown as nodes (boxes), arrows show dependencies • also called Activity-on-Node (AON) • supports all four dependency types.
Activity-on-Node (AON)	Node contains: `Task A` `ES=0, EF=5` `LS=0, LF=5`	• Most common modern format where nodes represent activities and arrows represent logical relationships • simpler than AOA, no dummy activities needed.
Activity-on-Arrow (AOA)	Node `1` `→` (Activity A) `→` Node `2`	• Activities shown as arrows, nodes represent events/milestones • only supports finish-to-start dependencies • requires dummy activities for complex logic.

Table 1: Network Diagram Types

Method	Example	Description
Precedence Diagramming Method (PDM)	Boxes `A` `→` `B` `→` `C` with arrows between nodes	• Activities shown as nodes (boxes), arrows show dependencies • also called Activity-on-Node (AON) • supports all four dependency types.
Activity-on-Node (AON)	Node contains: `Task A` `ES=0, EF=5` `LS=0, LF=5`	• Most common modern format where nodes represent activities and arrows represent logical relationships • simpler than AOA, no dummy activities needed.
Activity-on-Arrow (AOA)	Node `1` `→` (Activity A) `→` Node `2`	• Activities shown as arrows, nodes represent events/milestones • only supports finish-to-start dependencies • requires dummy activities for complex logic.