B163™is the most comprehensive AIA Owner-Architect agreement. This three-part document contains, among other things, a thorough list of 83 possible services divided among nine phases, covering pre-design through supplemental services. Part One of the document deals with variables typical of many Owner-Architect agreements, such as compensation and scope of services. Part Two contains detailed descriptions of the specific services found in Part One's matrix. Part Three contains general descriptions of the parties' duties and responsibilities.