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CHAPTER 1: INTRODUCTION TO SAD, SYSTEM DESIGN, PEOPLE, Complete…

- - - - 1.computer program that is designed to run a computer's hardware and application programs.
      - 2.used to manage the computer itself
      - 3.runs in the background, maintaining the computer's basic functions so users can run higher-level application software to perform certain tasks.
    - - 1.order processing system
      - 2.payroll system
      - 3.company communications networks.
- - - - Use a series of phases.( SDLC )
      - A popular systems.
      - Traditional system development technique.
      - A predictive approach.
      - A process-centered technique.
      - To modeling the processes.
      - Uses a set of process models.
        
        Process model
      - SDLC model
        
        Systems Design
        
        Systems Implementation
        
        Systems Planning.
        
        Systems Analysis
        
        Fact-finding approach to gain better understanding:
        
        Observation
        
        Sampling
        
        Document review
        
        Surveys
        
        Interviews
        
        Exploration began during the system planning phase
        
        Fact-finding result can build:
        
        Data and process models
        
        Object models
        
        Business models
        
        Explore bussiness processes and document to satisfy users for the new system
        
        Several bussiness tools that are specific to second phase:
        
        Requirements gathering
        
        Structured analysis
        
        CASE (Computer Aided Systems/ Software Engineering
        
        Construct logical model for new system
        
        The deliverable in system analysis phase is: The System Requirements Document
        
        The System Requirements document describes:
        
        Cost and benefits
        
        Outlines alternative development strategies
        
        Management and user requirements
        
        Systems Support and Security
- - - - hardware
        
        [̲̅H][̲̅A][̲̅R][̲̅D][̲̅W][̲̅A][̲̅R][̲̅E]
        
        example of hardware
        
        monitor
        
        scanner
        
        printer
        
        physical component of a computer system containing a circuit board, ICs, or other electronics
        
        without a hardware, your computer would'nt exist and
        a software could'nt be used.
        
        internal hardware referred as components,
        external hardware devices called peripherals.
      - software
      - data
        
        Raw data (sometimes called source data, atomic data or primary data) is data that has not been processed for use.
        
        data that has undergone processing is sometimes referred to as cooked data.
        
        data can be financial transactions from a point of sale (POS) terminal, computer logs or even participant eye tracking data in a research project.
        
        A spreadsheet such as Microsoft Excel or Google sheets allows users to format, organize and graph data to reveal simple trends and help summarize data.
        
        There is generally not much value in holding onto raw data without a way to use it
        
        Raw data may contain personally identifiable information (PII).
        
        Many large businesses today recognize the value of raw data. Consumer data is a hot commodity that they can buy and sell to build profiles of users or target a specific audience
      - processes
      - people
      - information system compenen is components that collect, manipulate and disseminate data and information and provide feedback
  - - - specialized system router internet
      - manfacture microchips
      - control complex entities
- - - - 4.Test the program
      - 5.Documents the program
      - 3.Write program instructions (code)
      - 6.Train programs users
      - 2.Develop a plan
      - 7.install and use the system
      - 1.Determine user needs
  - - - Effective AIS training should include employees’ orientation to new policies and operations
      - Training should occur before systems testing and conversion.
      - Employees can be hired from outside the company or transferred internally.
  - - - 2.Operations documentation
      - 3.User documentation
      - 1.Development documentation .
  - - - Processing of test transactions
      - Acceptance tests
      - Walk-through
  - - - Parallel conversion
      - Phase-in conversion
      - Direct conversion
      - Pilot conversion
  - - - Data content may be changed
      - File format may be changed
      - Files may be moved to a different storage