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Decision-Making and Investment Appraisal

Critical path analysis: building the network

  • 3 things to know
  • Component 2

Overview

Critical path analysis, node in a critical path network and activity in a critical path network.

What you need to know

Answer each one before you reveal it.

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Key term

How is the forward pass carried out?

Key term

How is the backward pass carried out?

Key term

What is total float?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is critical path analysis?

    Model answer

    Critical path analysis is a technique for scheduling a project made up of many activities. The network shows which activities depend on others and identifies the shortest possible completion time.

  2. 2

    What is a node in a critical path network?

    Model answer

    A node is a circle marking the start or finish of an activity. Each node carries a number, the earliest start time and the latest finish time.

  3. 3

    What is an activity in a critical path network?

    Model answer

    An activity is a task that takes time and resources, drawn as an arrow between two nodes. The arrow is labelled with the activity letter and its duration.

  4. 4

    What is meant by a dependency?

    Model answer

    A dependency is a requirement that one activity finish before another can begin. Dependencies determine the shape of the network and cannot be ignored to save time.

  5. 5

    What is the earliest start time?

    Model answer

    The earliest start time is the soonest an activity can begin, given everything that must happen first. Earliest start times are found by working forwards through the network.

  6. 6

    What is the latest finish time?

    Model answer

    The latest finish time is the last moment an activity can end without delaying the whole project. Latest finish times are found by working backwards from the final node.

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