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.
A must-read article on the effects of change in construction projects by Arthur O’Leary called Coping with Changes during Construction takes a very savvy look at both the reasons changes happen, along with strategies around managing the risk. While O'Leary's focus is on construction projects, this advice and rules are equally valid for projects in any industry that have complexities such as: many moving parts, suppliers, subcontractors, customers, complex WBS, multiple resource types, etc.