Project Management - Critical path method
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A step-by-step process for identifying Critical Path once you have identified the activities, duration and predecessor for a given project.
Transcript of Project Management - Critical path method
- 1. Critical Path Vazi Okhandiar, PMP, MCT, MBA, MSCS, BSEE NR Computer Learning Center 1835 W. Orangewood, #200 Orange . CA 92868 (714) 505-3475 www.nrclc.com
2. Critical Path Method (CPM) The critical path method is a project modelingtechnique developed in the late 1950s by Morgan R. Walker of DuPont and James E. Kelley, Jr. of Remington Rand. - Wikipedia 3. Critical Path The critical path method was examined by theUnited States Navy, and established a version in 1958 called a PERT (Program Evaluation and Review Technique) analysis. PERT claimed to reduce project management time by up to 42 percent, and was first used in the development of the Polaris missile. Ref: http://www.ehow.com/about_4703555_whatcritical-path.html#ixzz2igTEV3Q7 4. Critical Path A Critical Path is the path with the least amount offloat or slack time. A float time is the amount of time that an activity can be delayed without delaying the project. A Critical Path is the longest amount of time it will take to complete the project. A Critical Path usually has 0 float but may have negative float if the end task is constrained to an early finish date. If any of the task identified in the critical path is late, then the project will be late. 5. 6. Steps for identifying Critical Path 1. 2. 3.Specify the activates, duration and dependencies Draw a network diagram. Perform the forward pass to identify all Early Start and Early Finish times for the network. Early Finish = Early Start + Duration4.Perform the backward pass to identify all Late Start and Late Finish times for the network. Late Start = Late Finish Duration5.Calculate the slack time. Float = Late Start (LS) Early Start (ES)6.Identify the task on critical path with 0 float (slack) time. 6. 1. Task/Duration/Predecessor TAS K A B C D E F GDuratio Predecess n or 2 ---2 A 1 A 3 A 1 C,D 3 B 2 E,F 7. Terminologies ID Task ID D- Duration ES Early Start EF Early Finish LS Late StartES LF Late FinishF ID DR LS LF S - SlackEF 8. 2. Network Diagram B 2F 3Activity A 2C 1G 2Duratio n ESD 3E 1F LSEF ID DR LF 9. 3. Forward Pass 2Early Start4 B 21st2 A 27 F 3EarlyDuration= 9daysFinish 25 D 373 C 12045task starts at 0 EF = ES + DR ES = EF of predecessor When more than one predecessor, pick the larger #6 E 19 G 2ES F LSEF ID DR LF 10. 4. Backward Pass 24 B 21st task should end with LS = 0.202 A 2 0 2 Late Start2447 F 3 4 7 79 G 2 7 93C 1 56Late Finish2LS = LF - DR LF = LS of successor5 D 3 3 656 E 1 6 7When more than one successor, pick the smallest #ES F LSEF ID DR LF 11. 5. Slack / Float 2 4 0 B 2 2 40 2 0 A 2 0 24 7 0 F 3 4 7 7 9 0 G 2 7 92 3 3 C 1 5 6Float = LS ES2 5 1 D 3 3 65 6 1 E 1 6 7Float = Late Start (LS) Early Start (ES)ES F LSEF ID DR LF 12. 6. Critical Path The path with 0 Float is the critical path.0 2 0 A 2 0 22 4 0 B 2 2 44 7 0 F 3 4 7A-B-F-G is the critical 5 path. 6 0 C 1 5 62 5 0 D 3 2 5 LS = LF - DR LF = LS of successor70 G 2 75 6 1 E 1 6 79 9ES F LSEF ID DR LF 13. Thank You! Vazi Okhandiar, PMP, MCT, MBA, MSCS, BSEE NR Computer Learning Center 1835 W. Orangewood, Suite 200 Orange, CA 92868 www.nrclc.com . (714) 505. 3475 [email protected]
