There has long been a tendency on the part of employers to hire independent contractors for certain kinds of work. This commonly includes construction, but could also be any kind of short term, non-recurring service. For example, consultants are independent contractors, most attorneys and Certified Public Accountants are independent contractors.
Al-Khamis, Abdulwahab, "An Evaluation of “Contractor Performance: How Good Are Contingent Workers at theProfessional Level”" (1998). Engineering and Technology Management Student Projects. 1971.