The practical ability of A/Es to exercise control over the jobsite is mixed. On one hand, A/Es typically lack the authority (based on typical General Conditions), expertise, and continuous site presence to control the site. They rarely become involved in decisions involving site layout, scheduling the trades, or housekeeping. On the other hand, as Gambatese (2000) and others have pointed out, key design decisions by A/Es can substantially influence what must be accomplished on-site.