Much of the discussion thus far associated with the employment of building information modeling (BIM) has focused on the design phase; the preparation of the model by the designers, "ownership" of the model, and liability for others' use of and reliance on the model. The first generation of BIM employed by constructors involved the creation of a three-dimensional model based upon the two-dimensional drawings prepared by the designers. One of the greatly touted advantages of the next generation of BIM is the creation of a single model for the project to which the designers, constructors and owners will contribute. The manner in which the model is generated and the additional information associated with the model, however, will impact the utility of the model for the designers, constructors and owners. The functions for which BIM will be most beneficial to constructors include the preparation of schedules and estimates, tracking and managing changes to the work and shop drawings, and managing site logistics and temporary structures and services, with particular attention to site safety. The purpose of this paper is to identify the constructor's requirements for the preparation of a building information model during the design phase so as to most efficiently address the concerns of the designers, constructors and owners. In addition, the paper will examine the processesemployed by constructors in the management of the construction project.