A new methodology for building design is presented: Building Information Modeling (BIM). BIM is a three-dimensional representation of the architecture and structure of a building and the systems within it (mechanical, electrical, and plumbing). Project management for building design is being replaced with Infrastructure Lifecycle Management (ILM) that spans planning, building, and operating a building. Business value is increased by the integration of BIM and ILM. BIM drawings accompanying contracts can reduce misunderstandings.