At the time of Mr. Smith's discharge from the hospital, he was instructed to return to the outpatient department for follow-up care. On his first visit as an outpatient, a new outpatient record was started for him, and he was assigned a new number. After three outpatient visits, he was discharged from the outpatient department and his outpatient record was filed permanently in the outpatient department. This filing system would be described as