James A.O'Brien Introduction to Information Systems Eleventh edition 13 Database Development 1.Data Planning Physical Models Enterprise Model 5.Physical Design 2.Requirements Specifications Logical Models User Needs Description 4.Logical Design 3.Conceptual Design Data ModelsJames A. O’Brien Introduction to Information Systems Eleventh Edition 13 Database Development User Needs Description 1. Data Planning Enterprise Model 2. Requirements Specifications 3. Conceptual Design 4. Logical Design Physical Models 5. Physical Design Data Models Logical Models