Dragonfly case study

DRAGONFLY: Developing a proposal for an
Uninhabited Aerial Vehicle (UAV)

Dragonfly – Proposal Development:

1. The activities involved for the project schedule can be represented using Central Path Method (shown below) showing various interdependence and parallelism among activities. 2. The red dotted line represents the circular dependency between activity A4 and activity A9. 3. The Earliest Start (ES) and Earliest Finish (EF) and Latest Start (LS) and Latest Finish (LF) times are calculated using Forward Pass and Backward Pass Algorithm.

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4. The critical path for the project is found by calculating slack as per CPM as shown in the table below. The activities marked in green forms the critical path, I e.,

A1 ( A2 ( A4 ( A5 ( A8 ( A9

| |LF-EF |LS-ES |SLACK |CRITICAL PATH |
|ACTIVITY | | | | |
|A1 |9-9 |0-0 |0 |Y |
|A2 |12-12 |9-9 |0 |Y |
|A3 |27-23 |16-12 |4 |N |
|A4 |19-19 |12-12 |0 |Y |
|A5 |27-27 |19-19 |0 |Y |
|A6 |27-25 |21-19 |2 |N |
|A7 |52-46 |31-25 |6 |N |
|A8 |37-37 |27-27 |0 |Y |
|A9 |52-52 |37-37 |0 |Y |
|A10 |57-57 |52-52 |0 |Y |

5. For visual understanding, the critical path is marked green in the CPM flow for the project schedule below.

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6. Using CPM we can deduce the Project completion time to be equal