4.4.2 Database Specification and Design.4.3.1 Proposed System Operation Flowchart.4.3 Control Center / Overall Dataflow Diagram.4.2 Cohesion and Decomposition High level Model.3.7 High Level Model of the Proposed System.3.5.1 Use Case Diagram Of The Admin / User Privileges.3.4.3 Justification of the Proposed System.3.4.2 Advantages of the Proposed System.3.4.1 Data Flow Diagram of the Proposed System.3.2.2 Disadvantages Of The Existing System.3.1.1 Problem Identification Using SSADM.