A project management office, abbreviated to PMO, is a group or department within a business, agency or enterprise that defines and maintains standards for project management within the organization. The PMO strives to standardize and introduce economies of repetition in the execution of projects. The PMO is the source of documentation, guidance and metrics on the practice of project management and execution. In some organizations this is known as the program management office (sometimes abbreviated to PgMO to differentiate); the subtle difference is that program management relates to governing the management of several related projects.