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Lecture Systems analysis and design methods (7/e): Chapter 12 – Whitten, Bentley

In this chapter you will learn more about the design phase of systems development. You will know that you understand the process of systems design when you can: Describe the design phase in terms of your information building blocks, identify and differentiate between several systems design strategies, describe the design phase tasks in terms of a computer-based solution for an in-house development project,. | Chapter 12 Systems Design Objectives Describe the design phase in terms of your information building blocks. Identify and differentiate between several systems design strategies. Describe the design phase tasks in terms of a computer-based solution for an in-house development project. Describe the design phase in terms of a computer-based solution involving procurement of a commercial systems software solution. 12- 12- System Design Systems design – the specification of a detailed computer-based solution. Also called physical design. systems analysis emphasizes the business problem systems design emphasizes the technical or implementation concerns of the system. 12- System Design Approaches Model-Driven Modern structured design Information engineering Prototyping Object-oriented RAD JAD 12- Model-Driven Approaches Model-driven strategy – a system design approach that emphasizes drawing system models to document technical and implementation aspects of a system. 12- | Chapter 12 Systems Design Objectives Describe the design phase in terms of your information building blocks. Identify and differentiate between several systems design strategies. Describe the design phase tasks in terms of a computer-based solution for an in-house development project. Describe the design phase in terms of a computer-based solution involving procurement of a commercial systems software solution. 12- 12- System Design Systems design – the specification of a detailed computer-based solution. Also called physical design. systems analysis emphasizes the business problem systems design emphasizes the technical or implementation concerns of the system. 12- System Design Approaches Model-Driven Modern structured design Information engineering Prototyping Object-oriented RAD JAD 12- Model-Driven Approaches Model-driven strategy – a system design approach that emphasizes drawing system models to document technical and implementation aspects of a system. 12- Model-Driven Approaches – Modern Structured Design Modern structured design – a system design technique that decomposes the system’s processes into manageable components. Synonyms (although technically inaccurate) are top-down program design and structured programming. Design in a top-down hierarchy of modules Easier to implement and maintain (change). Modules should be highly cohesive Accomplish one function only Modules should be loosely coupled Minimally dependent on one another 12- Structure Chart 12- Model-Driven Approaches – Information Engineering Information engineering (IE) – a model-driven and data-centered, but process-sensitive technique for planning, analyzing, and designing information systems. IE models are pictures that illustrate and synchronize the system’s data and processes. The primary tool of IE is a data model diagram. 12- Physical Entity Relationship Diagram 12- Model-Driven Approaches – Prototyping Prototype – a small-scale, incomplete, but .