STR N421 - Lecture 7 - 2011

# Drmagedezzatgeorgy representation representation of

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Unformatted text preview: . Thus, this value represents the longest possible duration or highest possible cost for the task. Dr. Maged Ezzat Georgy Representation Representation of PERT PERT Values (a, m, b) Let us look at a simple representation of the three value This value. This applies to either time or cost. Optimistic value (a) Most likely value (m) Pessimistic value (b) 3 5 9 Dr. Maged Ezzat Georgy Representation Representation of PERT PERT Values (a, m, b) We examined how the values (a, m, b) can be associated associated with a construction task. Emphasis hereinafter will be given to project scheduling. However, all presented will also apply to cost estimating. Further comments will be added later to the use of these three value in “range estimating”. Dr. Maged Ezzat Georgy Representation Representation of Activity Activity Duration D a m b Dr. Maged Ezzat Georgy Representation Representation of Project Project Network te , σ e te , σ e te , σ e Tsum , & σsum te , σ e te , σ e te , σ e Dr. Maged Ezzat Georgy Activity Activity Calculations te (expected time for an activity) = σe (expected SD for an activity) = a+4m+b 6 b-a 6 ve (expected variance for an activity) = (σe)2 Dr. Maged Ezzat Georgy S A M P L E Dr. Maged Ezzat Georgy Representation Representation of Project Project Network Again … te , σ e te , σ e te , σ e Tsum , sum & σsum te , σ e te , σ e ????? te , σ e Dr. Maged Ezzat Georgy Schedule Calculations Obviously we need to add the activity durations to get the total project duration. However, adding activity durations sh...
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## This document was uploaded on 01/22/2014.

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