Critical Path Analysis

Introduction to Critical Path Analysis

  • Critical Path Analysis is a project management tool that helps organise and schedule tasks within a project.
  • It is a method used to estimate the minimum project duration and determine the amount of scheduling flexibility.

Definition of Terms

  • Node: It represents an event within a project. An event marks the start and end of a task or activity.
  • Activity: Represented by a straight, arrowed line (arcs) linking two nodes, this designates a specific task or operation within a project.
  • Precedence relationship: This determines the sequence of activities; some activities can’t start until a preceding one has been completed.

Constructing a Network Diagram

  • A network diagram is a graphical representation of the tasks and activities involved in a project. It assists in visualising the workflow of a project.
  • Activities are represented by arrows from one node (start of the activity) to another (end of the activity), while events are represented by circles or nodes.

Critical Path

  • The critical path is the longest duration path through the network. It identifies tasks that directly impact the project completion time.
  • Any delay in activities on the critical path leads to a delay in the project completion time.

Earliest Start Time and Latest Finish Time

  • Earliest Start Time (EST) and Latest Finish Time (LFT) computations are used to determine the critical path.
  • EST for a task is the latest of the earliest finish times for its predecessor tasks. While LFT for a task is the earliest start time for the task that immediately follows it.

Float or Slack

  • Float or slack refers to the amount of time that you can delay an activity without affecting the overall project completion time.
  • Tasks on the critical path typically have zero float.

Remember, Critical Path Analysis is not merely about learning the methods - it is about understanding how these methods can facilitate effective project planning and management. Practice with different examples to improve your understanding.