Ch10_Project Management

Ch10_Project Management - Example 10.2 - Single Time...

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Unformatted text preview: Example 10.2 - Single Time Estimate Immediate Predecessors P1 P2 Activity A B C D E F G Time 21 5 7 2 5 8 2 Path 1 2 3 4 1 A A A A 2 B B C C Path 1 2 3 4 1 21 21 21 21 2 5 5 7 7 A A B C C E In this example, each path through the network is identified and evaluated. The time for a path is the total time for all activities in the path. The path with the longest time is the "CRITICAL PATH." D D F In this example there are two critical pathes (AB-D-E-G) and (A-C-E-G). Activities in Path 3 4 D E D F E G F G Activity Times 3 2 2 8 5 4 8 5 2 2 5 G G 5 2 2 Total 38 35 38 35 = Critical Path = Critical Path In this example, each path through the network is identified and evaluated. The time for a path is the total time for all activities in the path. The path with the longest time is the "CRITICAL PATH." In this example there are two critical pathes (AB-D-E-G) and (A-C-E-G). = Critical Path = Critical Path Example 10.3 - Three Time Estimates Activity Time Estimates Activity Designation Expected Activity Time Variance a m b Immediate Predecessors P1 P2 Design A 10 22 28 21.0 9.00 Build prototype B 4 4 10 5.0 1.00 A Evaluate equipment C 4 6 14 7.0 2.78 A Test prototype D 1 2 3 2.0 0.11 B Write report E 1 5 9 5.0 1.78 C D Write methods report F 7 8 9 8.0 0.11 C D Write final report G 2 2 2 2.0 0.00 E F Exhibit 10.8 - Activity Estimated Times and Variances Activity Expected Designation Time Earliest Start Earliest Finish Latest Finish Latest Start Slack Time Activity Variance 9.0 A 21.0 0.0 21.0 21.0 0.0 0.0 B 5.0 21.0 26.0 26.0 21.0 0.0 C 7.0 21.0 28.0 28.0 21.0 0.0 D 2.0 26.0 28.0 28.0 26.0 0.0 E 5.0 28.0 33.0 36.0 31.0 3.0 F 8.0 28.0 36.0 36.0 28.0 0.0 0.1 G 2.0 36.0 38.0 38.0 36.0 0.0 0.0 11.9 = Variance of Critical Path 3.45 = Std. Deviation of Critical Path 2.8 35 = Project Due Date -0.87 = Calculated Z-value 0.192 = Probability of On-Time Completion = indicates Critical path Exhibit 10.10 - Time-Cost Trade-off Example Activity Designation A B C D Normal Time 2 5 4 3 Crash Time 1 2 3 1 Normal Cost $6 $9 $6 $5 Crash Cost $10 $18 $8 $9 Activity Designation Earliest Start Earliest Finish Latest Finish Latest Start A B C D 0 2 2 7 2 7 6 10 0 2 3 7 = Crashed = Critical Path Slack Time Activity Cost 2 0 7 0 7 1 10 0 Total Project Cost = $6 $9 $6 $5 $26 Time To Complete Project = 10 Days Crashed 0 0 0 0 ...
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