OPP, Ltd., together with its subsidiary, The Institute for Personality and Ability Testing, Inc., provides business psychology consultancy services for organizations. It engages in the development and supply of assessment instruments, books, and interpretive services to the behavioural science profession. The company also sources and sells psychometric instruments, including personality questionnaires, team building and development questionnaires, management development instruments, and aptitude for business learning exercises series. In addition, it provides consultancy services in the areas of talent management, management development, leadership effectiveness, and change enablement, as well as certification, qualification, and application training. It has strategic partnerships with CPP, Inc. and Center for Creative Leadership. The company offers its services in Europe, North America, the Far East, Australia, and Asia Pacific. OPP, Ltd. was formerly known as Oxford Psychologists Press, Ltd. The company was founded in 1988 and is based in Oxford, the United Kingdom with offices in Ireland, Scotland, Belgium, Denmark, France, Chicago, Champaign, and the Netherlands.

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