system_analysis_tutorials - DEPARTMENT OF PHYSICS SPH 108...

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Nyongesa, ISAD 1 These assignments are group-based Date due: 1. Consider a simplified model of a supermarket whose inputs are purchased goods; outputs are sales by retail to customers and has three processing functions -purchasing, stocking and selling. These functions are subsystems that need to be managed (planned and controlled) and therefore, each of the processes has a control loop (organization). Additionally, an overall control subsystem overseas the control of each of the processes. Finally, the overall control subsystem is answerable to the board of directors/shareholders. The information flow in this model is as follows The management/board of directors provides an overall control statement which consists of objectives and standard of performance to the overall control subsystem. The overall system passes these control statements to each of the control subsystems for each function. The control subsystems then issue instructions for contracts to be negotiated and goods to be purchased; for stocks to be held, displayed and checked; and for goods to be advertised and promoted to encourage sales Feedback is provided to the control subsystems from each of the operational units so that performance can be measured. This feedback enables adjustments to be made to the way the processes are conducted or to the volume/types of input to each of the processes . At the same time, the overall control system receives feedback in summarized form from the operational units and from control subsystems. As a result of this, the budgets and operational plans may be adjusted or feedback may be provided to the board of directors to cause a change to the company objectives/standards of performance. Assignment (a) By assigning the information flow with numbers 1 to n, construct a simple control system model for a supermarket based on the information given above. (b) List the requirements for data processing within the supermarket. (c) *What are the roles of the system analyst in this case. UNIVERSITY OF NAIROBI DEPARTMENT OF PHYSICS SPH 108: INFORMATION SYSTEMS ANALYSIS & DESIGN TUTORIAL 1
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