First we must determine the application with the following screen:Let imagine that we have the next files and fields:L =>1. List of goodsORDERS => 2. Orders of goodswith fields:with fields:NUM => Number of goodsC => CompanyN => NameNUM => Number of goodsP => PriceQ => QuantitativeV => ValueThat stay with the next screens:andIn the same way we make description to the other elements of the database => keys, connections …The last steps from descriptions of the database are the processes 'Verification' and 'Generation' that make examine of the descriptions of the database. In this way we can correct errors in the bases levels.