Network Diagram Optimstic Likely Pessimistic

Optimistic pessimistic most likely time pert s three point time analysis looks at the shortest longest and normal time for completing tasks and projects. In the pert network illustrated in the figure below the target date for the completion of the project is 11 weeks. Standard date d optimistic a most likely m pessimistic b expected t e standard deviation s a 3 4 5 b 1 2 3 c 2 3 4 d 4 5 6 use the table above to calculate the following.

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To calculate the variance for each activity completion time if three standard deviation times were selected for the optimistic and pessimistic times then there are six standard deviations between them so the variance.

Network diagram optimstic likely pessimistic. Solution for aoa diagram most likely time optimistic time pessimistic time 2 4 6 2 3 5 1 3 4 3 4 5 3 5 7 5 7 9 d. 2 1 calculate the expected t e. The completion time of an activity having the highest probability. Problem4 using the following project information choose the right network diagram optimistic time estimate weeks most likely time estimates weeks pessimistic time estimates weeks immediate predecessor s activity none 12 10 16 4 4 10 d e d e 10.

2 3 6 3 4 6 4 6 8 aon diagram 1 3 4 2 4 6. Expected time optimistic 4 x most likely pessimistic 6 this expected time may be displayed on the network diagram. The shortest time in which an activity can be completed. Most likely t m.

Cpm activity on node network diagram the second and more important difference is that traditional cpm applies a single duration and cost estimate for each activity whereas traditional pert applies a 3 point weighted average duration estimate optimistic most likely and pessimistic for each activity and does not consider cost. Pert is a project scheduling technique which uses three estimates per activity to get the final estimate for the project duration. To calculate the variance for each activity completion time if three standard deviation times were selected for the optimistic and pessimistic. Pert charts are most commonly network diagrams in which the tasks or major activities are nodes boxes with arrows connecting them.

Most likely time expressed as t m represents estimate of time for completion of an activity which is neither optimistic nor pessimistic assuming that things should go in a normal way and if the activity is repeated several times in most of the cases it will be completed in time represented by t. From the above three different estimates pert suggests work out of the expected. Activities a b and c are the starting tasks while activities i and j are the end activities of the project dummy activities start and finish with duration 0 are added in the network diagram to make the calculation of critical paths simpler you can remove these dummy variables if you want. The longest time that an activity might require to complete.

The project network diagram with optimistic pessimistic and most likely time are given as below. Expected time optimistic 4 x most likely pessimistic 6 this expected time may be displayed on the network diagram.