MasterSpec is a master guide building and construction specification system used within the United States by architects, engineers, landscape architects, and interior designers to express results expected in construction. MasterSpec content and software is exclusively developed and distributed by Deltek (formerly Avitru) for the American Institute of Architects (AIA). It was developed in 1969 by the AIA to provide architects a means to create technical specifications without spending a lot of time researching products and writing up to date technical specifications from scratch. Content for MasterSpec is vetted by AIA-sponsored architectural and engineering review committees. In 2019, the company was acquired by Deltek, Inc. 
Content Libraries.
Today, MasterSpec consists of over 900 sections packaged in practice-specific libraries, following the MasterFormat 2018 standard:
Each MasterSpec section is organized into three parts following SectionFormat and consists of 5 components:
Formats.
The MasterSpec technical specifications are available in three distinct formats or type:
References.
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