# Activity definition q Activity sequencing q Activity duration

• Slides: 85

CPM估计 A: 100天 开始 结束 B: 10 天 chapter__3 42

PERT Formula and Example: PERT weighted average = 8 workdays + 4 X 10 workdays + 24 workdays = 12 days 6 where 8 = optimistic time, 10 = most likely time, and 24 = pessimistic time chapter__3 46

PERT举例 2, 3, 6 1 2 J 项 活动 J K L 4, 6, 8 K O, M, P 2, 3, 6 4, 6, 8 3, 4, 6 估计项目总历时 3 E δ 3, 4, 6 L δ 3. 33 4/6 16/36 6 4/6 16/36 4. 17 3/6 9/36 13. 5 1. 07 41/36 chapter__3 4 2 50

PERT举例 T=E+δ 68. 3/2 % 50% =13. 5+1. 07=14. 57 =34. 2% P=50%+34 2%=84. 2% -3 δ -2 δ -1 δ E 68. 3% +1 δ +2 δ +3 δ 95. 5% 99. 7% chapter__3 53

CPM估计 2 A: 100天 1 B: 10天 3 chapter__3 66

Float 例子 EF(C)=ES (C) +6=14 ES(G)=EF(C)+0=1 4 LF(C)=LS(G)0=14 LS(C)=LF (C) -6=8 TF=8 chapter__3 FF=1 70

Simple Example of Determining the Critical Path n Consider the following project network diagram. Assume all times are in days. a. How many paths are on this network diagram? b. How long is each path? c. Which is the critical path? d. What is the shortest amount of time needed to chapter__3 complete this project? 75

Determining the Critical Path for Project X chapter__3 76