The presence of symptoms associated with migraine was represented with the name of the symptom in FAOBJ, as the data collected is about the occurrence of a particular symptom. The test code value "OCCUR" is derived from the events class variable name --OCCUR, but is an assessment at a point in time, rather than about the event as a whole. The relationship of these symptoms to migraine is represented in FACAT, which indicates that these data were collected in the Migraine Symptoms Diary.