A system is disclosed that is designed to enable users to obtain a customized specification for a particular project, and to develop a final specification for the associated building project along with a variety of up to date supportive technical documentation relating to the selected building products and systems. The system may include a computer implemented work flow that presents the user with a plurality of screens to elicit user responses to various building product selection criteria. Based on the user responses, a list of qualifying building products/systems is presented to the user for final selection. The system is PC based for ease of use at a work site, and may periodically be connected to one or more manufacturers' web sites via the Internet to download the most recent information available about the manufacturer's products. The system contains a green feature that enables users to minimize the environmental impact of the building project.