The Dictionary is designed to be comprehensive in scope. Its range spans terms encountered in the practice of architecture from Classical to green, from traditional materials to the latest products, from precise definitions of architectural styles to the particulars of specifications writing. Many of the new terms are associated with major expansions in the field of building services, including air-conditioning systems, electrical supply systems, gas supply services, illumination engineering, noise control engineering, vertical transportation systems, security services, and waste disposal, water supply, and fire protection systems.