Differences between source oriented problem oriented medical record?

In a POMR or problem oriented medical record, the record is kept together by problem number (a number is assigned to each problem. Progress notes in these records are kept in SOAP format. S=subjective (chief complaint, present illness), O=objective (physical exam, labs), A=assessment (diagnosis, prognosis), P=plan (treatment).

In a SOMR or source oriented medical record, the record is kept together by subject matter (labs are all together, progress notes are all together). Progress notes in a SOMR are written in paragraph format.