This document discusses Building Information Modeling (BIM). BIM is a digital model where project information is stored. It can be 3D, 4D with time integration, or 5D including costs. BIM allows for clash detection, heat/solar analysis, coordinated drawings, improved prefabrication, and more accurate costs. To create a BIM, each discipline inputs their data into BIM software, which coordinates all the data. Disciplines then extract the coordinated data needed. Revit ensures full coordination by having only one BIM file where "a change anywhere is a change everywhere." The document provides examples of phasing BIM with architecture, structure, and MEP. It also discusses case studies of architectural design