The mission of AASHTO re:source is to build confidence in the testing, inspection and evaluation of construction materials by elevating quality, encouraging continual improvement, and sharing knowledge. We do this through our services and tools of our three major programs: the Laboratory Assessment Program (LAP), the Proficiency Sample Program (PSP), and the AASHTO Accreditation Program (AAP). AASHTO re:source is a technical service program of AASHTO (American Association of State Highway and Transportation Officials), an international leader in setting technical standards for all phases of highway system development. AASHTO represents all fifty states, Washington D.C. and Puerto Rico and serves as a liaison between the state departments of transportation and the federal government. AASHTO’s primary goal is to foster the development, operation, and maintenance of an integrated national transportation system.