Systems Analysis and Design Alan Dennis and Barbara
Systems Analysis and Design Alan Dennis and Barbara Haley Wixom John Wiley & Sons, Inc. Slides by Fred Niederman Slide 1 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Introduction Chapter 1 Slide 2 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Key Ideas The systems analyst is a key person analysing the business, identifying opportunities for improvement, and designing information systems to implement these ideas. It is important to understand develop through practice the skills needed to design and implement new information systems successfully. 3 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
THE SYSTEMS DEVELOPMENT LIFE CYCLE Slide 4 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Project Phases Planning Why build the system? Analysis What, when, where will the system be? Design How will the system work? Implementation System delivery 5 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
A “Simple” Process for Making Lunch 6 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Planning Identifying business value Analyse feasibility Develop work plan Staff the project Control and direct project 7 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Analysis Information gathering Process modeling Data modeling 8 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Design Physical design Architectural design Interface design Database and file design Program design 9 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Implementation Construction Installation 10 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Processes and Deliverables Process 11 Product Planning Project plan (requirements) Analysis System proposal (function spec) Design System spec (detailed design) Implementation New system & Maintenance plan Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
SYSTEM DEVELOPMENT METHODOLOGIES Slide 12 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
What Is a Methodology? A formalised approach or series of steps Examples Process-centred Data-centred Object-oriented 13 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Waterfall Development Method 14 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Pros and Cons of the Waterfall Method Pros Cons Identifies systems requirements long before programming begins Design must be specified on paper before programming begins Long time between system proposal and delivery of new system 15 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Alternatives to the SDLC Parallel Development Rapid Application Development (RAD) Phased Development Prototyping Spiral Development Packaged Systems 16 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Parallel Development Method 17 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Pros and Cons of Parallel Development Pros 18 Cons Reduces Scheduled Time Still Uses Paper Documents Less Chance of Rework Sub-projects May Be Difficult to Integrate Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Rapid Application Development CASE tools Joint application design (JAD) sessions Fourth generation/visualisation programming languages Code generators 19 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Three RAD Categories Phased development A series of versions Prototyping System prototyping Throw-away prototyping Design prototyping 20 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
How Prototyping Works 21 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Throwaway Prototyping 22 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Criteria for Selecting the Appropriate Methodology Clear user requirements Familiar technology Complexity Reliability Time schedule Schedule visibility 23 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
Summary The Systems Development Lifecycle: Planning, Analysis, Design, and Implementation Development methodologies: the waterfall method, the parallel development method, the phased development method, system prototyping and design prototyping. 24 Power. Point Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved.
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