Performance Programs Company is a vocational educational publisher specializing in real estate textbooks which prepare students for professional licensure. The company's flagship title is Principles of Real Estate Practice by Stephen Mettling and David Cusic, a 460-page fundamentals textbook used by private schools and community colleges in 30 states. Performance Programs Company also publishes an expanding line of license exam preparation titles called "Real Estate License Exam Prep (RELEP)" series. Each title in the RELEP series includes national and state-specific cram cards, and 700+ practice questions. Other titles include R.E. Math Express and Buying and Selling Real Property in the United States.