The Advanced Construction Technology System (ACTS) is a computer database for the classification, documentation, storage and retrieval of information about emerging construction technologies. ACTS consists of a custom MS Windows application, classification and keyword files, and a database of emerging technologies. It currently includes 397 technologies that relate to civil, architectural, electrical, instrumentation, mechanical, and piping systems. Technologies have been classified according to the CSI Masterformat, indexed using a predetermined set of keywords, and described according to a standard format that determines the type, amount and organization of information about each technology. The ACTS project was supported by the Construction Industry Institute and the Construction Productivity Advancement Research program (CPAR) of the Corps of Engineers.