Field and office productivity and the use of prefabrication in the Electrical Contracting industry are intertwined.  This project explored the impact and use of prefabrication within Lean Construction and BIM and VDC.  The focus was to untangle and objectively characterize the relationship between productivity and prefabrication.  The investigation resulted in a set of best practices that can help Electrical Contractors optimize prefabrication to obtain peak productivity.