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pert cpm

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pert cpm

Post by Ramoncito on Fri Aug 27, 2010 11:38 am

greetings.....recently in one of our projects bidded out ....titled "re-roofing of nfa warehouse in narra, palawan", our regional engineer recommended that a pert-cpm as earlier requested and required in our bidding documents .... question?????could same be sustituted by a a gantt chart and/or s curve...do you agree? if yes , Y..... if no ...Y....thanks
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Re: pert cpm

Post by engrjhez® on Fri Aug 27, 2010 8:49 pm

Ramoncito wrote:greetings.....recently in one of our projects bidded out ....titled "re-roofing of nfa warehouse in narra, palawan", our regional engineer recommended that a pert-cpm as earlier requested and required in our bidding documents .... question?????could same be sustituted by a a gantt chart and/or s curve...do you agree? if yes , Y..... if no ...Y....thanks
As part of the procuring entity, you have to answer your own question based on your needs. Here your considerations:

PERT/CPM (Project Evaluation ReviewTechnique/Critical Path Method) is more of a technique. It helps predict and determine requirements as it is implemented. It is used if there are critical activities that need to be accomplished on time. You determine those activities and you put the best person to ensure the activity is accomplished on time. It is a generally accepted engineering approach.

The Gantt Chart is only a 2D bar graph that shows each activity as it is planned. The abscissa (x-axis) is time while the ordinate (not necessarily y-axis) enumerates the activities in nearest logical order. It is useful for simple monitoring of projects and does not need to be technical to understand.

S-Curve is a linear graph that usually plots the release of (monetary) resources with time. It can be plotted to overlap the Gantt chart (because the x-axis is the same). It is called S-curve id it resembles an "S" shape. If it happens, then the resources are at optimum - meaning at its best disbursement.

If there is a need to finish the project on time and be technically sound on the necessary preparations, use the PERT/CPM. Otherwise, if there are no strict deadlines, use the Gantt Chart/S-Curve.

Hope this helps. Smile
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Re: pert cpm

Post by RDV @ GP3i on Sat Aug 28, 2010 9:40 am

engrjhez® wrote:
Ramoncito wrote:greetings.....recently in one of our projects bidded out ....titled "re-roofing of nfa warehouse in narra, palawan", our regional engineer recommended that a pert-cpm as earlier requested and required in our bidding documents .... question?????could same be sustituted by a a gantt chart and/or s curve...do you agree? if yes , Y..... if no ...Y....thanks
As part of the procuring entity, you have to answer your own question based on your needs. Here your considerations:

PERT/CPM (Project Evaluation ReviewTechnique/Critical Path Method) is more of a technique. It helps predict and determine requirements as it is implemented. It is used if there are critical activities that need to be accomplished on time. You determine those activities and you put the best person to ensure the activity is accomplished on time. It is a generally accepted engineering approach.

The Gantt Chart is only a 2D bar graph that shows each activity as it is planned. The abscissa (x-axis) is time while the ordinate (not necessarily y-axis) enumerates the activities in nearest logical order. It is useful for simple monitoring of projects and does not need to be technical to understand.

S-Curve is a linear graph that usually plots the release of (monetary) resources with time. It can be plotted to overlap the Gantt chart (because the x-axis is the same). It is called S-curve id it resembles an "S" shape. If it happens, then the resources are at optimum - meaning at its best disbursement.

If there is a need to finish the project on time and be technically sound on the necessary preparations, use the PERT/CPM. Otherwise, if there are no strict deadlines, use the Gantt Chart/S-Curve.

Hope this helps. Smile

The inputs from engrjhez would definitely help (when you prepare the bidding documents for your succeeding biddings for infra). For the moment, since your requirement in your bid docs is the submission of PERT/CPM, using the pass-fail criteria, the bidder which submitted a Gantt Chart or S-Curve should be automatically disqualified during bid opening. If they want to argue that the Gantt Chart or S-Curve could substitute for your requirement, you can tell said bidder to file an MR and explain in writing why you should consider his argument. But during bid opening, you should automatically disqualify for non-compliance. Remember, bid opening should be non-discretionary on your part.
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Re: pert cpm

Post by Ramoncito on Sat Aug 28, 2010 11:46 am

many thanks . . .engrjhez . . . i guess we did approach the problem similarly...and sthrengthens our position with your comments .
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Re: pert cpm

Post by engrjhez® on Sat Aug 28, 2010 12:33 pm

Ramoncito wrote:many thanks . . .engrjhez . . . i guess we did approach the problem similarly...and sthrengthens our position with your comments .
No problem. But as RDV said, since you required PERT/CPM in your bidding documents, it must be distinguished from any other document that seems to serve the same purpose. And since it is non-discretionary, you should have no problem in rejecting and accepting the submitted documents.

Have a nice day!Smile
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