A group of Preferred Term (PT)s and Lowest Level Term (LLT)s relating to a particular medical condition or concept. It could also include High Level Term (HLT)s and High Level Group Term (HLGT)s, as well as hierarchies. Such a grouping is helpful in formulating a “case definition” and in data exploration, search, and retrieval. Each medical condition or group of related conditions has one or more individual SMQs. Terms listed in the SMQ define signs, symptoms, events, laboratory data, physical and physiological findings, and so on.