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The Construction Specifications Institute (CSI) is an organization that maintains and advances the standardization of construction language as pertains to building specifications. CSI provides structured guidelines for specification writing in their Project Resource Manual, (formerly called the Manual of Practice (MOP)).

CSI authored MasterFormat, which is an indexing system for organizing construction data, particularly construction specifications. For many years MasterFormat consisted of 16 Divisions of construction, such as Masonry, Electrical, Finishes, or Mechanical. In November 2004, MasterFormat was expanded to 50 Divisions, reflecting the growing complexity of the construction industry, as well as the need to incorporate facility life cycle and maintenance information into the building knowledge base. In this way, MasterFormat will eventually help facilitate Building Information Modeling (BIM) to contain project specifications. However, current technology is unable to handle specifications to the degree drawing information is able to be referenced, displayed, quantified and other benefits of BIM. For example integrated systems, industry standards and methods that may not be shown in the drawings (because they are typically explained in the specifications) do not fit neatly within current BIM libraries.

The MasterFormat standard serves as the organizational structure for construction industry publications such as the Sweets catalog with a wide range of building products, and MasterSpec, a popular specification software. MasterFormat helps architects, engineers, owners, contractors, and manufacturers classify how various products are typically used. Nearly all CSI approved sections also include performance and safety requirements generated by agencies such as the American Society for Testing and Materials (ASTM), Occupational Safety Health Administration (OSHA), and numerous other federal and professional organizations.

CSI's Uniform Drawing System comprises the largest part of the National CAD Standard (NCS), together with the American Institute of Architects (AIA)'s CAD Layer Guidelines, and Tri-services Plotting Guidelines. Administered by the National Institute of Building Sciences (NIBS), the NCS coordinates these CAD-related publications to allow consistent and streamlined communication among owners and design/construction teams.

• CSINet Home
• MasterFormat.com
• National CAD Standard Official Site
• Reed First Source - a directory of commercial building products, manufacturers and specifications by CSI MasterFormat 2004 division