How is an examination maintained/updated?
Current certificants are urged to write and submit questions, as long as they pertain to a section of the Body of Knowledge and cite a reference. These questions (“items”) are placed into our Item Bank, marked “ready for review.” Annually, PTC, reviews questions to validate the format, consistency, and make it a “readable” question and answers. Groups of current certificants then review the items for clarity, accuracy, relevancy, and applicability to the Body of Knowledge. These reviewed items are returned to the Item Bank, marked “ready for examination.” Semi-annually, the Board of Directors meets to review a new form of the examination. They re-check every question individually. They also review statistical information about the performance of Items on previous versions of the examination. Once the entire examination has been reviewed, they conduct a psychometric exercise to set the passing score. Throughout its history, the CCPDT has kept the difficulty of its examinations equivalent so the passing score has not changed, but should any form of the examination be determined to be somewhat more or less difficult than the previous version, the passing score may be changed.