The Professional Engineering Services (PES) , provides a streamlined approach for federal agencies to access qualified firms in a multitude of engineering disciplines. The PES schedule allows for choice, flexibility, ease of use, and quick access to industry experts doing business worldwide. All socioeconomic classifications are represented. Use of the GSA Multiple Award Schedules program significantly reduces acquisition lead times and lessens administrative cost and burden for federal agencies. This multiple award schedule grants agencies direct access to the commercial experts who can thoroughly address the needs of the federal engineering community through six Special Item Numbers (SINs) that comprise the distinct phases of an engineering project. These cover the major disciplines of mechanical, electrical, chemical and components of civil engineering, as well as numerous sub-disciplines such as: aerospace, nuclear, bioengineering, and marine architecture.