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System Analysis

System Analysis and Design. System Analysis. - Mr. Ahmad Al-Ghoul. learning Objectives. Explain the Characteristics of a Good Analysis Method Explain Why Use a Methodology Describe the three categorizes of system development methodologies Process-centered Methodologies

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System Analysis

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  1. System Analysis and Design System Analysis - Mr. Ahmad Al-Ghoul

  2. learning Objectives • Explain the Characteristics of a Good Analysis Method • Explain Why Use a Methodology • Describe the three categorizes of system development methodologies • Process-centered Methodologies • Data-centered Methodologies • Object-oriented methodologies • Explain Waterfall Development, Parallel Development, rapid application development (RAD) System Analysis and Design System Analysis

  3. Introduction The process of system analysis and its planning includes various stages. Over the years various methodologies have been defined for this process. The methodologies themselves constitute a method that regulates the various stages in the process of planning and developing the information system. Each methodology has its own advantages and disadvantages but, generally, the correct methodology must be adapted to the required system. System Analysis and Design System Analysis

  4. Introduction • A methodology is a formalized approach to implementing the SDLC. • Justified by experience • A methodology may or may not prescribe a Life Cycle Model. • The methodology will vary depending on whether the emphasis is on businesses processes or on the data that supports the business. System Analysis and Design System Analysis

  5. Systems Development Methodologies • Characteristics of a Good Analysis Method • Graphical with supporting text. • Allow system to be viewed in a top-down and partitioned fashion. • Minimum redundancies. • Reader should be able to predict system behavior. • Easy to understand by user. System Analysis and Design System Analysis

  6. Systems Development Methodologies • Why Use a Methodology? • Distilled experience/best practice • Ensures user involvement • Helps inexperienced analysts • Provides planning and control System Analysis and Design System Analysis

  7. Systems Development Methodologies • Process-centered Methodologies • This kind of methodologies focus on defining the activities associated with the system. • concentrate on representing the system concept as a set of processes with information flowing into and out of the processes. System Analysis and Design System Analysis

  8. Systems Development Methodologies • Data-centered Methodologies • These methodologies focuses on defining the content of the data storage containers and how they are organized rather than the activities which comes later. • Data-centered methodologies utilize data models as the core of understanding the system concept, other models will be less important. System Analysis and Design System Analysis

  9. Systems Development Methodologies • Object-oriented methodologies • This methodology attempts to balance the focus between processes and data. • Object-oriented methodology work well in situation in which complicated IS need continues maintenance, adaptation and redesign System Analysis and Design System Analysis

  10. Systems Development Methodologies • Waterfall Development • With waterfall development- based methodologies, the analysts and users proceed sequentially from one phase to the next. • The advantages of waterfall development-based methodologies are: • The system requirements are identified long before programming begins. • Changes to the requirements are minimized as the project proceeds. • Good for project management • Results in solid, well-constructed systems System Analysis and Design System Analysis

  11. Systems Development Methodologies • The disadvantages of waterfall development-based methodologies are: • The design must be completely specified before programming begins. • A long time elapses between the completion of the system proposal in the analysis phase and the delivery of the system. • Difficult (expensive) to accommodate change after process is underway System Analysis and Design System Analysis

  12. Systems Development Methodologies [3] Waterfall Development System Analysis and Design System Analysis

  13. Systems Development Methodologies • Parallel Development • This methodology attempts to address the long time interval between the analysis phase and the delivery of the system. System Analysis and Design System Analysis

  14. Systems Development Methodologies [3] System Analysis and Design System Analysis

  15. Systems Development Methodologies • Rapid Application Development (RAD) • RAD-based methodologies adjust the SDLC phases to get some part of system developed quickly and into the hands of the users. • Most RAD-based methodologies recommend that analysts use special techniques and computer tools to speed up the analysis, design, and implementation phases, such as CASE (computer-aided software engineering) tools. System Analysis and Design System Analysis

  16. Systems Development Methodologies • Rapid Application Development (RAD) • Five key factors • Extensive user involvement • Joint Application Design sessions • Prototyping • Integrated CASE tools • Code generators System Analysis and Design System Analysis

  17. Systems Development Methodologies • Rapid Application Development (RAD) • RAD is a general strategy rather than a single methodology • Goals • To analyze a business process rapidly • To design a viable system solution through intense cooperation between users and developers • To get the finished application into the hands of the users quickly • Traditional SDLC steps are followed, but phases are combined • Iteration is limited to design and development phases System Analysis and Design System Analysis

  18. Systems Development Methodologies (RAD) [2] System Analysis and Design System Analysis

  19. Sequence Summary • A methodology is a formalized approach to implementing the SDLC. • Process centered methodologies, the focus is on defining the activities associated with the system. • Data centered methodologies focuses on defining the content of the data storage containers and how they are organized. • Object-oriented methodology attempts to balance the focus between processes and data. • waterfall development- based methodologies, the analysts and users proceed sequentially from one phase to the next. • Rapid application development (RAD) resembles a condensed version of the entire SDLC, with users involved every step of the way System Analysis and Design System Analysis

  20. Sequence Summary • In this Sequence we have • Defined the term development methodology • Explained the Characteristics of a Good Analysis Method • Explained Why Use a Methodology • Described the three categorizes of system development methodologies • Process-centered Methodologies • Data-centered Methodologies • Object-oriented methodologies • Explained Waterfall Development, Parallel Development, and rapid application development (RAD). System Analysis and Design System Analysis

  21. Reference [1] System Analysis and Design, Sixth Edition Authors: Gary B. Shelly, Thomas J. Cashman and Harry J. Rosenblatt Publisher: SHELLY CASHMAN SEWIES. [2] Modern Systems Analysis and Design Third Edition Authors: Jeffrey A. Hoffer , Joey F. George, Joseph S. Valacich Publisher: prentice hall [3] System Analysis and Design, 3rd Edition Authors: Dennis, Wixom, & Roth Publisher: John Wiley & sons System Analysis and Design System Analysis

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