Appendix 1 / Solutions to Review Questions and Case Studies
Duration (days) A B
C D E F G H I
J ML
Activity Receive kit Order engine Manufacture trim Assemble shell Paint shell Test engine Add trim Insert engine Test Ship = Most Likely Opt.
A D B
=
C,E G, F H I Optimistic
Opt. 15 5 2 1 1 1 1 1
ML
4
1 Pess.
=
20 15 3 2 2 2 2 2 5 3 Pessimistic
Pess. 25 25 4
3 3 9
3 6 12 8
3
The network diagram is shown in Figure A1.23.
4
Estimates of the durations of the activities are given in the case but an expected duration has to be calculated from the optimistic, most likely and pessimistic estimates. This is shown below: Duration (days) ML Pess. Expected 20 25 20 15 25 15 3 4 3
A B
C D E F G H I
J ML Decision-Making
Predecessors
Techniques
=
Activity Predecessors Opt. Receive kit 15 Order engine 5 Manufacture 2 trim Assemble shell A 1 Paint shell D 1 Test engine B 1 C,E Add trim 1 Insert engine G, F 1 Test H 4 Ship I 1 Pess. Most Likely Opt. = Optimistic
Edinburgh Business School
2 2 2 2 2 5 3
=
3 3 9
3 6
12 8 Pessimistic
2 2 3 2 2.5 6
3.5
IA1/Ssl