terça-feira, dezembro 26, 2006

PMP - Activity Duration Tools

Question from Hermann Ludwig :

"Activity duration estimating process determines the work periods required to complete each activity. Can the activity duration tools and techniques also be used for calculating overall project duration ?
Or schedule development is the only process where overall project duration is calculated ?

Manuel, can you also let me know if the CPM technique uses one-point or 3-point estimates?

Best Regards"

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Hallo Hermann.

I'll try to answer to the best of my knowledge.

WBS and Activity duration estimation are related. However to calculate the overall project duration one needs to consider various schedule compression techniques like fast tracking, crashing, resourse levelling and so forth, which is a part of schedule development techniques and hence it is logical to include project duration calculation as part of schedule development.

Let's put it another way. The first and foremost activity in calculating the overall project duration is to:

- develop the sequence of activities using the network diagrams;

- find out the availability of resources for each of the activities;

- Estimate the activity duration;

- schedule the activities using critical chain techniques;

- This will give you the over all project duration.

Schedule development is essential for creating buffers based on resource availability and other other known constraints.

The CPM techniques are based on the assumption that resources are always available in abundance. So it is not realistic.

I hope it helped. If you've got any further questions don't hesitate to mail me.

Manuel Augusto Antão