APAR is an acronym which stands for Authorized Program Analysis Report.
An APAR announced the entry of each new bug into the IBM process. If it was a genuine problem, the details would be sent for resolution to Rochester (for system problems) or Menlo Park / Rayners Lane (for application problems in MMAS, CMAS or DMAS). Eventually the APAR would be fixed by a corresponding PTF.
- IBM FAQ FQ116127 "What is the definition of an APAR...?"