PMI does not specify the courses that one can do in self learning for earning the PDUs. It definitely mentions that the courses have to be from a REP approved by PMI. Some of the quality concepts such as lean principles and Kanban are discussed in ACP and in PMP quality management is one of the processes. Therefore continuing to enhance the knowledge through Six Sigma certifications and the PDUs earned may contribute to CCR. Do you have a different opinion or thought? Please share.