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SYSTEM ANALYSIS - Coggle Diagram

- - - - Outputs
        
        The inventory system must produce a daily report showing the part number, description, quantity on hand, quantity allocated, quantity available, and unit cost of all sorted by part number.
      - Inputs
        
        Each input form must include date, time, product code, customer number, and quantity.
      - Processes
        
        The accounts receivable system must prepare customer statements by the third business day of the following month.
      - Performance
        
        The accounts receivable system must prepare customer statements by the third business day of the following month
      - Controls
        
        An employee record must be added, changed, or deleted only by a member of the human resources department.
  - - - Who?
        
        Who performs each of the procedures within the system? Why? Are the correct people performing the activity? Could other people perform the tasks more effectively?
      - What?
        
        What is being done? What procedures are being followed? Why is that process necessary? Often, procedures are followed for many years and no one knows why. You should question why a procedure is being followed at all
      - Where?
        
        Where are operations being performed? Why? Where could they be performed? Could they be performed more efficiently elsewhere?
      - When?
        
        When is a procedure performed? Why is it being performed at this time? Is this the best time?
      - How?
        
        How is a procedure performed? Why is it performed in that manner? Could it be performed
    - - Interviews
        
        Interviewing is an important fact-finding tool during the systems analysis phase. An interview is a planned meeting during which you obtain information from another person.
        
        7 seven step of interview
        
        Step 1 : Determine the people to interview.
        
        Step 2 : Establish objectives for the interview.
        
        Step 3 : Develop interview questions.
        
        Step 4 : Prepare for the interview.
        
        Step 5 : Conduct the interview.
        
        Step 6 : Document the interview.
        
        Step 7 : Evaluate the interview
        
        Documentation review
        
        You usually can obtain document samples during interviews with the people who perform that procedure.
        
        Observations
        
        Seeing the system in action gives you additional perspective and a better understanding of the system procedures
        
        Questionnaires
        
        A questionnaire, also called a survey, is a document containing a number of standard questions that can be sent to many individuals
        
        Sampling
        
        The samples might include records, reports, operational logs, data entry documents, complaint summaries, work requests, and various types of forms.
        
        Sampling techniques include
        
        Systematic sampling
        
        Stratified sampling
        
        Random sampling
        
        Research
        
        Your research can include the Internet, IT magazines, and books to obtain background information, technical material, and news about industry trends and developments
- - - - The questions generated before the information was gathered should be reviewed
    - - Gather together all relevant information that has been collected.
    - - Analysis of parts may be simply adding up numbers and averaging them or comparing information to examine the relationship of one thing to another, or two things together
    - - It is likely that quantitative (numbers) information will be computed by hand, or with the use of adding machines.
    - - Analysis of qualitative (descriptive) information is a creative and critical process.
    - - Putting the analyzed parts together in a way that tells the complete story can be done by the team that has been assigned to gather and analyze information.
  - - - Involves graphical methods and nontechnical language that represent the system at various stages of development
    - - A functional decomposition diagram (FDD) is a top-down representation of a function or process.
    - - UML uses object-oriented design concepts, but it is independent of any specific programming language and can be used to describe business processes and requirements generally
        
        use case diagrams
        
        Systems analysts can draw use case diagrams freehand or use CASE tools that integrate the use cases into the overall system design
        
        sequence diagram
        
        A sequence diagram shows the timing of interactions between objects as they occur
- - - - The physical characteristics of a data store are unimportant because you are concerned only with a logical model
    - - Shows only external entities that provide data to the system or receive output from the system
- - - - Documenting the Data Elements
        
        The following attributes usually are recorded and described
        
        Data element name and label
        
        Alias
        
        Type and length
        
        Default value
        
        Acceptable values - Domain and validity rules
        
        Source
        
        Security
        
        Responsible user(s)
        
        Description and comments
  - - - Process name or label
        
        Description
        
        Process number
        
        Process description
  - - - Entity name
        
        Description
        
        Alternate name(s)
        
        Input data flows
        
        Output data flows
  - - - Record or data structure name
        
        Definition or description
        
        Alternate name(s)
        
        Attributes
- - - - Symbol
        
        A rectangle represents a step or process
        
        A diamond shape represents a condition or decision
        
        The logic follows the lines in the direction indicated by the arrows.
      - Sequence
        
        The completion of steps in sequential order, one after another
        
        One or more of the steps might represent a subprocess that contains additional logical structures.
      - Selection
        
        The completion of one of two or more process steps based on the results of a test or condition.
        
        In the example, the system tests the input, and if the hours are greater than 40, it performs the CALCULATE OVERTIME PAY process
      - Iteration
        
        The completion of a process step that is repeated until a specific condition changes
        
        An example of iteration is a process that continues to print paychecks until it reaches the end of the payroll file. Iteration also is called looping
    - - Might look familiar to programming students because it resembles pseudocode
      - The primary purpose of structured English is to describe the underlying business logic
    - - Shows a logical structure, with all possible combinations of conditions and resulting actions
      - It is important to consider every possible outcome to ensure that you have overlooked nothing
      - Types of tables;
        
        Tables with one condition
        
        Tables with two condition
        
        Tables with three condition
        
        Table with multiple outcomes