The concept is the basic element of flexibility in OpenMRS. Concepts are the individual data points collected from a population of patients. Concepts include both questions and answers. For example, blood type data is collected for a patient. The question is "What is the blood type for the patient?", with a set of discrete answers of "A, B, AB or O". To implement this in OpenMRS with concepts, the question is a concept ("blood type") and each response ("A", "B", "AB" and "O") is also a concept. For this one question, a total of 5 concepts are required.