One of the techniques he recommended was having them keep monthly exercises diaries, and reviewing them at each visit. He called them, logically enough, "Patient Exercise Diaries" or PED.
His suggestion was to keep older diaries in files at my office, and at each appointment compare them to a patient's most recent one. Then he put up a slide summarizing this idea:
It said "COMPARE PED-FILES AT EVERY VISIT." (try saying "PED-files" out loud).
It's a good thing they couldn't see or hear me. Because I lost it.