Systems Development Life Cycle - Definition, Investigation and Analysis

  • Created by: lauren778
  • Created on: 11-04-18 23:00
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  • SDLC
    • Definition
      • The standard method that SW developers follow when making a computer system.
        • It is a series of tasks, completed in sequence, which allows a SW solution to be developed
          • Linear sequential approach
        • Once a project has begun, it is impossible to change the requirements
    • Investigation
      • Feasibility Report
        • Definition
          • Report that considers the request for a new system from different perspectives, to determine whether it is worth the organisation undertaking the project.
        • Should Include
          • User requirements
          • Definition of the scope of the current system
          • Identification of problems with the current system
          • Cost-benefit analysis of the new system
    • Analysis
      • Definition
        • Mapping the existing system used by the organisation using various analysis tools
      • Analysis Tools
        • Data Flow Diagrams
          • Use standard symbols to describe how data moves in a data processing system
            • Uses objects to represent external or internal sources
        • ER Diagrams
          • Used to represent how different groups of data relate to each other
            • Entities are people or things that the data is concerned with (eg. Customers or products)
            • Attributes are the things about entities that will be stored (eg. First name, address, product number etc.)
      • Follows the decision to create a new system on the basis of the Feasibility report
      • Detail the existing system and further understand the user requirements
      • Detailed job, often carried out by specialist systems analysts
      • Poor analysis could mean that mistakes from the old system are repeated in the new system


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