ict unit 2

  • Created by: owenaoife
  • Created on: 26-11-20 11:27
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  • ICT- Unit 2
    • End User
      • the end user is used to describe the person the system is ultimately being designed for, based on what they like and want they want the system to do
        • end users  have an active role throughout the development process. the end user provides feedback after every refinement or iteration and will be updated based on their feedback which will then meet the end user's needs
    • Prototyping
      • a method of producing incomplete versions of digital technology system. prototyping will show the end user the layout of the system interface
      • 2 types
        • evolutionary prototyping
          • incomplete version of the final system is developed and presented to the end user
        • throwaway prototyping
          • is one that will not be part of the final solution
      • advantages
        • final digital system more likely to meet end users needs
        • disadvantages
          • end users may confuse the prototype with the final system and therefore expect to see all elements shown to them during experimentation with prototype as a part of the final system
            • not suitable for systems witch use batch processing
    • database design elements
      • forms reports and wireframe diagrams
        • wireframe diagram allows the developer to consider the layout of the elements  it show the font colour size and style for the end user
      • navigational structure
        • a diagram that illustrates various pathways along which the end user can move through a data base
      • data dictionary
        • is file which contains details relating to the structure of data held in a database it is produced at the design stage during development and contains enough information for database developer to create the database
      • ERD (entity-relationship diagram)
        • this is the links between the table on the database
          • one-to-one
            • one-to-many
              • many-to-many
    • SQL (structured queries language)
      • SELECT- to specify what data is to be displayed
      • FROM- to identify the source of the data to be interrogated
      • WHERE- to identify the criteria to be used to select data from the source
    • types of testing
      • black box testing-where the tester is unaware of the internal structure of the application they are testing
      • white box- a method of testing which examines the underlying structure of the application or code which has been developed
      • alpha testing- involves simulating the real-world environment the application normally carried out by a small number of users and prior to beta testing
      • beta testing carried out after alpha and before the final version of the application is released commercatly
      • A/B testing end users are presented versions of the digital application statistical analysis is carried our to determine which is most successful


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