Product and Service Codes (PSC) are used by the federal government to describe products, services, and research purchased under contracts. The PSC Manual was updated in 2011 to reflect environmental attributes, technological changes, and the addition or removal of codes. PSC codes have a standard four character structure indicating the industry and type of item or service. Knowing a company's PSC codes helps in efficiently searching for relevant contracting opportunities and ensuring qualifications to bid on solicitations. The manual makes it easy to identify the appropriate PSC codes for a business.