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large companies (DuPont, Dow, etc.) divest their world-class engineering groups that ran projects internally and operate on a skeleton crew because it’s not core business. The general-contractors-turned-CMs take their cue and say, “We can fill that gap by becoming the agent of the owner.” And they “lean down” because general contracting is no longer their core business either.
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Todd R. Zabelle (Built to Fail: Why Construction Projects Take So Long, Cost Too Much, And How to Fix It)