One of the first principles of project controls is that the project budget has to be time-phased over the duration of the project. Here’s why: It’s not enough to simply know the total budget for a project – it’s critical to also know when that budget is planned to be spent. In other words, each quantity of material, labor hour or subcontractor service that’s planned for the project, is planned to occur at a particular time on the project.

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You're Not Alone. Project cost overruns are common.

Statistics will tell you that over 85% of projects go over budget. But Why? What are the mechanics behind project cost overruns and project schedule delays? Plenty of talented and experienced professionals engage in dialog about this very topic every day, and try to arrive at conclusions about how to stop projects from going over budget. In this article I’d like to shed some light on the underlying workings as to the root causes of cost overruns and schedule delays. In order to tackle the problem of how to eliminate overruns, it’s important to understand the main reasons why they happen.

Mohamed El-Mehalawi, PhD, PMP

Here is real story.