That’s staff augmentation which is completely different. If your company doesn’t know anything about Salesforce for instance and you just need a one off large project, you are going to hire a consulting company to go off and do the work and leave.

It doesn’t make sense to build the competencies in house if that’s not your core line of business’s

I left our part of my explanation of a general contractor. I meant when you are having a physical structure built like a house or in the case the analogy would be adding on to your office building