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Methodologies of SDLC

Lecture 5. Methodologies of SDLC. Lecturer details. Methodologies of the SDLC Traditional Approach to SDLC Object-Oriented Approach to SDLC CASE Tools. What is Methodology. Methodology Comprehensive guidelines to follow for completing every SDLC activity

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Methodologies of SDLC

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  1. Lecture 5 Methodologies of SDLC

  2. Lecturer details • Methodologies of the SDLC • Traditional Approach to SDLC • Object-Oriented Approach to SDLC • CASE Tools

  3. What is Methodology • Methodology • Comprehensive guidelines to follow for completing every SDLC activity • Collection of models, tools, and techniques

  4. What is a model • Models • Representation of an important aspect of real world, but not same as real thing • physical (like a model of an airplane) • abstract (e.g. in form of mathematical notation)

  5. What are Tools • Tools • Software support that helps create models or other required project components • Range from simple drawing programs to complex CASE tools to project management software

  6. What are Techniques • Techniques • Collection of guidelines that help analysts complete a system development activity or task • Can be step-by-step instructions or just general advice

  7. Two approaches to system development • Traditional approach (1) • Also called structured system development • Structured analysis and design technique (SADT) • Object-oriented approach (2) • Also called OOA, OOD, and OOP • Views information system as collection of interacting objects that work together to accomplish tasks.

  8. Traditional approach (1) • Structured Analysis • Define data, system needs to store and use (data requirements) • Define inputs and outputs • Define how functions work together to accomplish tasks • Data flow diagrams (DFD) and entity relationship diagrams (ERD) show results of structured analysis • ‏

  9. Traditional approach (1) • Technique developed to provide design guidelines • What set of programs should be • What program should accomplish • How programs should be organized into a hierarchy • Modules are shown with structure chart

  10. Traditional approach (1) • Structured programming • Improves computer program quality • Allows other programmers to easily read and modify code • Each program module has one beginning and one ending • Three programming constructs (sequence, decision, repetition)

  11. Traditional approach (1) • Stages overview

  12. Object-oriented approach (2) • Views information system as collection of interacting objects that work together to accomplish tasks • Objects – things in computer system that can respond to messages • OO languages: Java, C++, C#, .NET

  13. Object-oriented approach (2)

  14. Object-oriented approach (2) • Object-oriented analysis (OOA) • Defines types of objects users deal with • Shows use cases that are required to complete tasks • Object-oriented design (OOD) • Defines object types needed to communicate with people and devices in system • Shows how objects interact to complete tasks • Refines each type of object for implementation with specific language of environment • Object-oriented programming (OOP) • Writing statements in programming language to define what each type of object does • .NET, VB, Java

  15. Object-oriented approach (2) Class diagram made during OOA

  16. Computer Aided System Engineering(CASE) tools • CASE toolsare software tools designed to help systems analyst complete development tasks

  17. End Thank you ??????

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