8.7 Rule book and fact model maintenance 233 6. each rule statement involving the term or fact type identified in steps 2 and 4 should then be identified; 7. logic to ensure compliance with each rule identified in step 6 should be added to the database, table, column, or foreign key. If a message type, user interface, or data element is to be added, 1. the term describing the message type, user interface, or data element should be identified; 2. each rule statement involving the term identified in step 1 should then be identified; 3. logic to ensure compliance with each rule identified in step 2 should be added to the message type, user interface, or data element. 8.7.5 Modifying an existing implemented data component If a database table, column, or foreign key is to be modified, 1. each entity, attribute, or relationship implemented by the table, column, or foreign key should be identified; 2. the term describing each entity or attribute identified in step 1 should then be identified; 3. the fact type describing each relationship identified in step 1 should also be identified;