Skip to Main Content
Skip to Navigation
Project Management Orientation

Creating a Precedence Diagram  (continued)

In the following chart, notice that activity 1.1 is the predecessor to activity 1.2.  This means that activity 1.1 must be completed before activity 1.2 can start.  Following this logic, activity 2.2 cannot start until both activities 1.2 and 2.1 are both completed.  Note that there is no precedence relationship between 1.2 and 2.1, so there is no arrow connecting them.
  

PDM diagrams are frequently confused with PERT charts.  You can tell them apart because PERT charts contain multiple time estimates for each node, whereas PDM networks have a single time estimate for each work package.  PERT charts also use activity on arrow (AOA), where the arrow represents the activity and the node is the event; for example, the start or finish of an activity.

Graphic showing a precedence diagram.
1: Getting Started
2: Define the Project Team
3: Team Management
4: Identify and Validate Requirements
5: Create Decomposition Structures
6: Risk Management
7: Project Estimates
8: Project Schedules
9: Change Management
10: Project Control and Execution
Defining the Project
11: Project Management Review
12: Project Closeout
13: Project Management Tool Suite
14: Self-Assessment and Final Exam
Fast Points
Concepts
Seven Keys
Case Study
WWPMM
Mentor
Check Point
Previous button
Next button
Print button
Help button
Glossary button
Exit course button