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Development Life Cycle

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Notes de leçon

Program Development Life Cycle

  • The program development life cycle is a structured approach to creating software.
  • It consists of stages: Analysis, Design, Coding, Testing, and Maintenance.
  • Each stage produces outputs that feed into the next stage.

Analysis

  • The analysis stage aims to precisely understand the problem the program must solve.
  • Abstraction is used to remove unimportant details and focus on core functionality and requirements.
  • A requirements document is created, defining each requirement with a description and success criteria.
  • Example of abstraction: London Underground map – shows connections, not geographical accuracy.

Design

  • The design stage produces a blueprint for the solution.
  • Design can be presented using structure diagrams, flowcharts, or pseudocode.
  • The design must match the requirements from the analysis stage.

Coding

  • Developers write code in a suitable programming language, creating modules that work together.
  • Iterative testing is performed: each module is tested and debugged as it is built.
  • Modules are retested when new modules are added to ensure correct interaction.

Testing

  • The complete program is run many times with varying sets of test data.
  • Testing ensures the program works as intended and rejects invalid input.
  • Example test data: alphanumeric sequences for password validation.

Maintenance

  • After delivery, the program may need updates to fix bugs or add features.
  • Maintenance ensures the program continues to meet user needs.

Diapos

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Questions d'entraînement

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  1. 1.What is the first stage of the program development life cycle?

    Easy
    • AAnalysis
    • BDesign
    • CCoding
    • DTesting
  2. 2.Which stage of the program development life cycle involves producing a blueprint for the solution?

    Easy
    • AAnalysis
    • BDesign
    • CCoding
    • DTesting
  3. 3.What is the purpose of the analysis stage?

    Easy
    • ATo write the program code
    • BTo precisely understand the problem
    • CTo test the final program
    • DTo design the user interface
  4. 4.Which of the following is an example of abstraction?

    Easy
    • AWriting code in a high-level language
    • BRemoving unimportant details from a problem
    • CTesting each module individually
    • DCreating a requirements document
  5. 5.What is the purpose of a requirements document?

    Easy
    • ATo list the program code
    • BTo define the problem and break it down into clear parts
    • CTo test the program
    • DTo design the user interface
  6. 6.During which stage is iterative testing performed?

    Easy
    • AAnalysis
    • BDesign
    • CCoding
    • DFinal testing
  7. 7.What does iterative testing involve?

    Easy
    • ATesting only the final program
    • BTesting each module as it is developed and retesting when changes are made
    • CTesting all modules at once after coding is complete
    • DTesting only the user interface
  8. 8.Which type of test data would be used to test password validation?

    Medium
    • AOnly numeric data
    • BOnly alphabetic data
    • CAlphanumeric sequences
    • DOnly special characters

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