As an AABB and CAP assessor for many years now, I've had the opportunity to grow as an assesor of both organizations. Both have training for assessors, although the AABB training is presented annually, face to face, and on a variety of assessment topics. The quality plan has been explained over the years. The first actual CAP training I received was only last year, and was web based. My own personal feeling is that the CAP section/ questionaire for blood bank is superficial, where the AABB assessment tool is comprehensive. I think Blood Banks are better if they subscribe to and use the AABB standards to help the quality of their blood bank.