This class represents an "Assessment" of the Patient, either using a standardized Assessment Instrument (such as the American Spinal Injury Association Standard Neurological Classification of Spinal Cord Injury (ASIA)), or a set of observations made about the Patient by a SCIDO clinician. In the VA SCIDO system, each Assessment is stored in a separate table, with a number of fields common to them (such as date created and date modified). This class contains those properties that are common to many if not all of the assessment tables. It is noted that when the assessment uses a standardized Assessment Instrument, the Assessment Event class (in the Assessment package) contains many of these same properties, so these properties are marked as derived.