CSE1IS Information Systems
Tutorial - Week 11
System Design

La Trobe University, Bendigo campus Department of Computer Science and Computer Engineering
 

  1. In the Systems Design phase of the SDLC what precisely has to be designed?

  2. The Community Health Clinic (CHC) is a new medical centre offering specialist services to the public in many areas of medicine. The Centre is well-accepted by the community.

    When the Clinic began, a software consulting company was hired to install a computer system to handle the clinic's medical and financial needs. The system performed well. The system was then to be updated to include recording of patient's medical records and services received.

    An analyst/designer was employed for this task by the consulting company. After reviewing the documentation for the existing systems the analyst/designer interviewed the Clinic director and his assistant. An overall menu system was then produced which the two managers approved. The main menu would quickly switch to an input screen where patient data such as name, address, Medicare number and medical history could be entered. Other parts of the menu could be used to update a patient's record (retrieved by entering their Medicare number) with symptoms given and the treatment received for each visit.

    The plans were documented, approved and implemented. The system ran well initially but then began to cause problems. Patient complaints included incorrect medical histories, bills for the wrong services or services not received, returned bills because of incorrect addresses and some patients not billed at all.

    1. Describe how you think these inaccuracies were able to occur by referring to the stages of systems design where you think a poor methodology was applied in this situation.
    2. Outline in detail the editing and validation checks which could have been implemented to make sure data being entered was accurate and being recorded for the correct patient?
    3. How can the manager of an organisation make sure that these types of errors are not going to occur during a system's development?

  3. Who is most important to the systems design process, the designer, the manager or the users? Explain your answer.

  4. What skills do you see as being necessary to be a good systems designer?

  5. Does the option to use an off-the-shelf software package to solve an organisaton's data processing problems mean that a systems design phase is not needed? If a design phase is needed what precisely needs to be designed?

  6. In the VEA scenario from the video shown in the previous lecture, the OliVEA system implemented in 1993 needed an upgrade in 1998. Do you think that 5 years is an adequate lifespan for an information system? Apart from poor design what might make an IS become obolete in 5 years? How could a system be designed to last more than 5 years?

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