Building Information Modeling (BIM) is changing how buildings, infrastructure, and utilities are planned, designed, built, and managed. It describes the process of designing a building collaboratively using one coherent system of computer models rather than as separate sets of drawings. BIM encompasses all the information related to the building, including its physical and functional characteristics from which diagrams, drawings, 3D views, performance analysis and project schedules are easily generated. It increases productivity, performance and accuracy in building design and construction. This lecture is an overview of the BIM process principals and its application, with examples from current architectural projects.