D+HC offers education and/or training to Architects, Design Professionals, Specification Writers, General Contractors, Installers, Construction Inspectors, Facility Administrators/Directors, Maintenance and Operations Personnel, Distributors, Manufacturers and Factory Representatives and AHJS Authority Having Jurisdiction. Our education and training is aligned with the American Institute of Architects (AIA), Construction Specifications Institute (CSI), Door & Hardware Institute (DHI) and Door Security & Safety Foundation (DSSF).