"I'm not sure that you can say definitively that some roles are better filled by consultants, but I would say that some projects are better handled by consultants."

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In software, consultants sometimes tell you to buy into certain software-development methods to the exclusion of other methods. That’s unfortunate because if you buy into any single methodology 100 percent, you’ll see the whole world in terms of that methodology. In some instances, you’ll miss opportunities to use other methods better suited to your current problem.

— Steve McConnell