Participatory Guarantee Systems (PGS) are alternative certification systems for organic smallholder farmers that involve direct participation by stakeholders in certifying organic production and processing. PGS were developed as a low-cost option for small farms serving local markets. In Uganda, several PGS groups have been established since 2007 when PGS was adopted as an alternative to costly third-party certification. Examples are provided of existing PGS groups ranging in size from 23 to 1250 approved farmers. Key aspects of establishing and managing a successful PGS group are outlined.