The problem of determining, analysis and description of a particular application's information structure (and relations) and the process of mapping the information structure to a “good” data structure (in this case a DBTG-type structure) is considered. The applicability of a top-down oriented design procedure to a relatively large practical data base design case is demonstrated. A conceptual framework and a notation to be used for determining and definition of information requirements, information structure and information relations is suggested. A systematic and partly formalized approach to map an information structure to a DBTG-type data structure is discussed. The problem of analysis and evaluation of alternative DBTG-type structures is also considered. © 1976, ACM. All rights reserved.