Lecture 18 - CVEN 349: Civil Engineering Project Management...

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1 CVEN 349: Civil Engineering Project Management LECTURE # 18 Fall 2009 Dr. Ivan Damnjanovic Who Collects The As Who Collects The As-Built Information Built Information And When Is It Collected? ± We are going to assume that it is collected by the Contractor’s Project Manager or Field Superintendent. ± We are going to assume that it is collected on a regular basis at the construction site. Class Exercise ± At what point in the project is work accomplished measured? ± At what point in the project is cost information collected? ± If you have a choice, is it better to collect cost and schedule information, toward the beginning, the middle, or toward the end of a project?
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2 Cost Incurred versus Work Actually Accomplished ± There are three elements: (1) Cost incurred to date and (2) Work actually completed, and (3) the schedule. ± There may be little relationship between cost and results. That is, the project may be incurring costs but there may be few results to show for it. ± Costs incurred are easy to measure; % complete (work accomplished) may be difficult to measure. There are Several Approaches Used to Collect the % Complete ± Units Method – easily measured pieces of work requiring about the same amount of effort. ± Incremental Milestones – any work item involving parts that must be handled in sequence sequence. ± Start/Finish – any work item where a % complete is easy to measure or compute ± Opinion – any piece of work where other methods are too difficult. ± Cost Ratio – used only on administrative tasks active over the life of the project. Base Course Construction Day As-Planned Running Ft As-Built Running Ft As-Built % % Complete $$ Cost % Cost 1 2 3 960 480 4.5% 5% 51,000 $ 9% 4 960 720 6.8% 11% 102,000 $ 18% 5 960 1,110 10.5% 22% 153,000 $ 27% 6 960 1,110 10.5% 32% 204,000 $ 36% 7 960 1,110 10.5% 43% 255,000 $ 45% 8 960 1 110 10 5% 53% 306 000 $ 55% 1,110 10.5% 306,000 $ 9 960 1,110 10.5% 64% 357,000 $ 64% 10 960 1,110 10.5% 74% 408,000 $ 73% 11 960 1,110 10.5% 85% 459,000 $ 82% 12 960 1,110 10.5% 95% 510,000 $ 91% 13 960 480 4.5% 100% 561,000 $ 100% 14 15 16 17 The “learning curve” causes ramp-up and ramp-down which causes deviations from average.
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This note was uploaded on 05/28/2010 for the course CVEN 349 taught by Professor Damjanovic during the Fall '09 term at Texas A&M.

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Lecture 18 - CVEN 349: Civil Engineering Project Management...

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