Need Help on a question

Submitted by nidhitripathi on Thu, 08/04/2011 - 18:55

You are the project manager for Software Development project. The feasibility
study can start any time and takes 1 week and Requirement gathering takes
2 weeks which can start only after feasibility study. The Design and Test
Plan development can start in parallel after the Requirements gathering.
Test plan preparation takes 8 weeks followed by a review by the customer
and the time estimated for review is 1 week. After the review, Test Data
preparation takes 6 weeks. Design takes 6 weeks and it is followed by Development
and Unit Testing, for one module it takes 2 weeks and for the other module
it takes 2 weeks. There are no dependencies between modules and they can
be developed simultaneously. After Test Data preparation and Development
and Unit testing of both the modules, there is 2 weeks system testing.
What is the lag time on the critical path?


--------------------------------------------------------------------------------


Zero


1 week


2 weeks


3 weeks


Ans: 1 week


Please explain?


Thanks


Nidhi

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admin

Fri, 08/05/2011 - 03:30

There are 2 paths in the project critical path is 20 weeks and other path is 13 weeks. So lag time other path in comparison with Critical path is 7 weeks. They will have to wait 7 week before the start of system testing.


For answer to be 1 week, the question is not clear for me.

aaron

Fri, 08/05/2011 - 15:22

Lag time is the MUST WAIT time. No where in the question it states that an activity has to wait for a certain amount of time. So Lag time ON Critical path should be ZERO.