Gathering data is one of the primary roles of an appraiser. Data can be divided into Specific and General. Specific data is gathered from the home itself. Location, condition, amenities, size and other specific data are gathered by the appraiser during an inspection.
General data is gathered from a number of sources. Local Multiple Listing Services (MLS) provide data on recently sold homes that might be used as comparables. Tax records and other public documents verify actual sales prices in a market. Flood zone data is gathered from FEMA data outlets, such as a la mode's InterFlood product. And most importantly, the appraiser gathers general data from his or her past experience in creating appraisals for other properties in the same market.