Computers, Computer Science A technique for analysing data to its logical groupings. A set of raw, i.e., unstructured, data is reduced through a set of transformations (normalization) to basic data groups in which each item is grouped with its sole and full determinant. The effect of performing RDA, as a step in data design, is to reduce data redundancy and gain flexibility. During the normalization process, it is important that information is never lost, i.e., that all the original connections between data items are maintained. The output from RDA is a set of relations that are in the state known as Third Normal Form.