Particular estimators may also be assigned responsibility for utilizing the virtual processes associated with Laser Imaging and Business Information Modeling (BIM) technology to gather, generate, analyze and communicate information about all aspects, disciplines and systems of a building, in order to realize a single, virtual model of a building, which permits collaboration among owners, architects, engineers, construction managers and subcontractors, and facilitates cost estimation, clash detection and reduces change orders. The Estimator must have thorough understanding of estimating costs in the context of Construction Management (guaranteed maximum price) and General Contractor (lump sum) service delivery methods and the related cost impacts, the bidding and procurement processes, knowledge of state-of-the-art preconstruction services and construction practices, means & methods, constructability pricing, as well as costs and availability of labor, equipment, materials, general conditions/requirements, schedule, logistics, bonds, licenses, insurance and permits.