<prompt> Study of time, place and person is called as -Experimental epidemiologyAnalytical epidemiologyDescriptive epidemiologyRandomized controlled trial  <response>: Descriptive epidemiology Descriptive studies Descriptive studies are usually the first phase of an epidemiological investigation.These studies are concerned with observing the distribution of disease and identifying the characteristics with which the disease in question seems to be associated.Procedures in Descriptive Studies1. Defining the population to be studied2. Defining the disease under study3. Describing the disease byTimePlacePerson4. Measurement of disease5. Comparing with known indices6. Formulation of an etiological hypothesisDescriptive studies are used to formulate etiological hypothesis. 