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G048: Lecture 06 Critical Path Analysis

G048: Lecture 06 Critical Path Analysis. Mr C Johnston ICT Teacher www.computechedu.co.uk. Session Objectives. Understand the key requirements of critical path analysis (CPA) Understand the purpose, benefits and limitations of using such a tool

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G048: Lecture 06 Critical Path Analysis

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  1. G048: Lecture 06Critical Path Analysis Mr C Johnston ICT Teacher www.computechedu.co.uk

  2. Session Objectives • Understand the key requirements of critical path analysis (CPA) • Understand the purpose, benefits and limitations of using such a tool • Be able to apply the principles of CPA to a scenario.

  3. Planning and Monitoring Tool

  4. Critical Path Analysis • May be used as part of the decision making process • Enables a firm to plan and monitor operations • Time related – identifies the maximum time for an operation to be completed • Identify potential problems in implementing operation • Identifies where and when resources (including human ones) are needed

  5. Advantages Maximise efficiency in the use of time Improve efficiency and generate cost saving in the use of resources Beneficial to monitoring cash flow Disadvantages Usefulness may be limited in complex and large scale operations Necessity of having clear and reliable information Skilled management and team philosophy is essential Critical Path Analysis

  6. The Process

  7. CPA – The Process • Identify and prioritise the activities • Identify which activities MUST be done before others • EST – identify earliest start time – work from left to right adding up timings • LFT – identify latest finish time – work from right to left subtracting timings • Identify the critical path – points connecting ESTs and LFTs (where these are the same) • Identify the FLOAT – tasks which can be completed outside the critical path

  8. 1 2 Critical Path Analysis Earliest Start Time (EST) Arrows indicate the order of the tasks, the letter above shows the order, the time period below the arrow Node numbers showing order of activities in the left hand semi-circle of each node. A 3 B 3 5 5 The Critical Path Latest Finish Time (LFT) Nodes: Show the start and finish of a task

  9. Example 1 – Making Bread

  10. Exercise #1: New Product Feedback Draw a critical path analysis diagram for this scenario

  11. Exercise #2:Swimming Pool Installation Draw a critical path analysis diagram for this scenario

  12. 13 11 0 4 5 2 16 7 5 8 6 7 4 1 2 3 13 11 11 8 4 2 16 0 Exercise #2:Swimming Pool Installation B 4 E 1 H 7 I 2 A 2 C 3 F 2 J 3 D 5 G 5

  13. Exercise #3:Large Turbine Installation Draw a critical path analysis diagram for this scenario

  14. 5 13 13 6 0 20 23 6 1 4 3 5 7 2 16 5 9 20 23 13 0 A 6 D 4 G 7 B 5 I 3 E 8 H 2 C 4 F 8 Exercise #3:Large Turbine Installation

  15. Exercise #4:Aircraft Maintenance Work out the order / logic and then draw a critical path analysis for this scenario

  16. 11 4 4 6 2 0 9 6 7 1 5 2 3 4 5 11 5 6 0 9 2 E 4 B 2 A 2 F 3 H 2 C 4 D 2 G 4 Exercise #4:Aircraft Maintenance

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