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SYSTEM DESIGN - Coggle Diagram

- - - - Interface designer understand the underlying business functions and how system supports individual , departmental , enterprise goals.
        
        A goos starting point might be to analyze a funtional decomposition diagram (FDD).
    - - Studies show that people learn better visually.
        
        A well-design interface can help users learn a new system rapidly , and be more productive.
    - - A system analyze should understand user experience , knowledge , and skill levels.
        
        To develop a user-centered interface , the designer must learn to think like a user and see the system through a user's eyes.
    - - From a user's viewpoint , the interface is the most critical part of the system design because it is where the or she interacts with the system.
        
        It is essential to construct models and prototypes for user approval.
    - - UI should include all tasks , commands , and communications between users and the information system.
        
        Each screen option leads to another screen , with more option.
    - - Even after the system is operational , it is important to monitor system usage and solicit user suggestions.
        
        You can determine if system features are being used as intended by observing and surveying users.
    - - You should document all screen design for later use by programmers.
        
        If you are using a CASE tool or screen generator , number the screen desgin and save them in a hierarchy similar to a menu tree.
  - - - Facilitate the system design objectives , rather than calling attention to the interface.
        
        Create a design that is easy to learn and remember.
    - - Clearly label all controls, buttons and icons.
        
        Select only those images that users can understand easily , and provide on screen instructions that are logical , concise , and clear.
    - - Organize tasks , commands and functions in groups that resemble actual business operations.
        
        Create alphabetical menu lists.
        
        Provide shortcuts so ecperienced users can avoid multiple menu levels
    - - Ensure that Help is always available.
        
        Provide user-selected Help and context-sensitive Help.
    - - Create input masks.
        
        Display event-driven messages and reminders.
        
        Establish a list of predefined values that users can click to select.
        
        Build in rules that enforce data intergrity.
    - - Display messages at a logical place on the screen , and be consistent.
        
        Alert users to lengthy processing times or delay.
        
        Allow messages to remain on the screen long enough for users to read them.
    - - Use appropriate colors to highlight different areas of the screen.
        
        Use special effects sparingly.
        
        Group related objects and information.
    - - Remember that users are accustomed to a pattern of red=stop , yellow=coution , and green=go.
        
        Provide a keystroke alternative for each manu command.
        
        Use familiar cammnds if possible.
- - - - Range check * test data items to verify that they fall between a specified minimum and maximum value.
      - Reasonableness check
        
        indentifies values that are questionable , but not necessarily wrong.
      - Validity check
        
        used for data item that must certain values .
      - Data type check
        
        test to ensure that a data item fits the required data type.
      - Existence rules
        
        used for mandatory data items.
        
        example : if an employee record requires a Social Security number.
      - Combination check
        
        performed on 2 or more fileds to ensure that they consists or reasonable when considered together.
      - Sequence check
        
        used when the data be in some predetermined sequence
      - Batch controls
        
        totals used to varify batch input.
        
        might check data items such as record counts and numeric field totals.