As the National Building Information Model Standard (NBIMS) takes shape the National CAD Standard (NCS) has been included in the discussion. NCS plays an important role in the BIM process.

Simply stated, the NCS addresses paper-centric drafting as a means of producing design and construction drawings. NBIMS sets standards for typical processes and computer-based exchanges of information employed during the conception, creation, and operation of facilities. Since design and construction drawings, as well as computer-based virtual building models, are a typical product of building information modeling techniques, NCS will continue to be important as a standard for design and construction drawing output from the BIM process.

-exerpt quoted from http://www.buildingsmartalliance.org/index.php/nbims/faq/