Every credential holder with the exception of CAPM must adhere to PMI’s Continuing Certification Requirements (CCR) program to earn professional development units (PDUs) and maintain the credential. To follow the program, individuals participate in professional development activities. In general, one hour of time spent on professional development activities equals one PDU. More information about the CCR program, how to earn and claim PDUs per certification as well as instructions on how to renew the certification is available at the Maintain Your Certification page.