In the English-speaking world, the term has a particular currency in the world of software development, especially in circles connected to Computer Professionals for Social Responsibility (CPSR), who have put on a series of Participatory Design Conferences. It overlaps with the approach Extreme Programming takes to user involvement in design, but (possibly because of its European trade union origins) the Participatory Design tradition puts more emphasis on the involvement of a broad population of users rather than a small number of user representatives.