At the urging of industry advocates, the Construction Specifications Institute's (CSI) MasterFormat, a structured hierarchy of divisions and subsections that standardize information for construction project manuals, will now include a subsection on tubular daylighting devices (TDDs): subsection 08 62 23. Formerly, TDD products were not given a separate designation under MasterFormat and frequently were grouped under unit skylights, roof accessories, or window openings, none of which accurately described the specification of TDDs. For more information on the new specification, visit