All Project Management Professional (PMP) certified individuals must earn 60 professional development units (PDUs) within each 3-year certification cycle through activities in various categories in order to maintain their certification. These categories include courses, self-directed learning, volunteer work, and experience working as a project manager. PDUs can be recorded online and expired certifications can be renewed by reapplying and paying a fee if PDU requirements are met during the cycle. Those who do not earn enough PDUs within the cycle will be placed in a suspended status and risk expiration if not resolved in time.