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SYSTEM ANALYSIS - Coggle Diagram

- - - - The web site must report online volume statistics every four hours , and hourly during peak periods.
    - - Manufacturing employees must swipe their ID cards into online data collection terminals that record labor costs and calculate production effeciency.
    - - The student records system must calculate the GPA at the end of each semster.
    - - The system must support 25 users online simultansously.
    - - The system must provide logon security at the operating system level and at the application level.
  - - - When is a precedure performed? Why is it being performed at this time? Is this the best time?
    - - 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.
    - - Who performes each of the procedures when the system? Why? Are the correct people perform the tasks more effectively?
    - - Where are operation being perfomed? Why? Where could they be perfomed? Could be perfomed more efficienly elsewhere?
    - - 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 form another person.
        
        Limitations *must select the right information
      - DOCUMENTARY REVIEW
        
        Documentary review can help you understand how the current system is supposed to work.
        
        Limitations * the data can be outdate.
      - OBSERVATIONS
        
        Seeing the system in action gives you addtional prespective and a better understanding of the system procedures.
        
        benefit * less insavise than other methods.
        
        Limitation : not efficient method for obtaining quantitative data.
      - QUESTIONAIRES
        
        In projects where it is desirable to obtain input form a large number of people , a questionare can be valuable tool.
        
        Benefit : less sensitive bases introduction by interviewers.
        
        Limitation : survayor cannot control who actually responds to the survey.
      - SAMPLING
        
        When studying an information system, you should collect examples of actual documents using a process called sampling.
        
        The samples might include records, respons, operational logs, data entry documents, complaints summaries, work request, and various types of forms.
      - RESEARCH
        
        May not be suitable or application to current system.
        
        Benefits : able exchange opinions and thoughts throught the internat.
        
        Research also can involve a visit to a physical location, called a site visit. Where the objective is to observe a system in use at another location.
        
        Site visits also are important when considering the purchase of a software package.
- - - - A sequence diagram shows the timing of interactions between objects as they occur.
        
        A systems analyst might use a sequence diagram to show all possible outcomes, or focus on a single scenario
    - - During requiremens modeling, systems analyst and users work together to document requirements and model system functions.
        
        A use diagram visually represents the interaction between users and the information system.
- - - - USE CASE DIAGRAMS.
        
        Durinf requirements modeling, systems analyst and users work tohgether to document requirements and model system funtions.
        
        Use case diagram visually represents interaction between users & information system.
        
        User becomes an actor eith spesific role that describe he or she interacts wiith the system.
        
        Systems analyst can draw use case diagrams freehand or use CASE tool that integrate the use cases into overall system desgin.
      - SEQUENCE DIAGRAMS
        
        System analyst might use a sequence diagram to show all possible outcomes or focus a single scenario.
        
        Interaction proceeds from top to bottom along a vertical timeline, horizontal arrows represent messages from one object to another.
        
        A sequence diagram shows the timing of interactions between objects as they occur.
        
        Include symbols that present
        
        Classes
        
        Lifelines
        
        Messages
        
        focuses