This section of the paper discusses four factors that may explain why there is not widespread agreement about the respective roles that the entities typically involved in construction projects should play regarding site safety. The first factor is that detailed expectations about safety roles are not written in project contracts, governmental standards, or anywhere else. The only portion of project contracts that typically even mentions site safety is the general conditions, which are usually one of the model sets of general conditions provided by the American Institute of Architects (AIA) or the Engineers Joint Contract Documents Committee. Both of these documents explicitly state that the responsibility for site safety rests with the general contractor and do not mention the roles, however small, that designers and owners, or subcontractors could or should assume regarding safety (Toole 2002).