Assignment 02 , 2022. Due date 13 June 2022

School of computing Solution to Assignment 03 Structured Systems Analysis and Design ICT2621 Semester 2 2020 INTRODUCTION Dear student, Note that NO tutorial letters that will be sent to you for solutions, examination information or for any other issue, as was the case in years past. All this information will be found on the module’s website, in this case ICT2621, on myUnisa at www.My.U. The information will be found under Learning Units, Official Study Materials or Additional Resources on the site. This particular document is under Additional Resources. This document contains the solutions to Assignment 3 of Semester 2. If there is any error in this solution, an email will be sent to your myLife account to rectify it before the end of the semester. The assignment is marked out 100 marks. It contributes 60% towards the semester mark. The semester mark weighs 20% of the final mark. 2 SOLUTION SECOND SEMESTER ASSIGNMENT 03 2020, Total: 100 marks Chapter 5 – Data and Process Modelling Question 1 [26] NB: When drawing data flow diagrams (DFDs), use the Gane and Sarson symbols/notation. Read pages 143 to 160 of the prescribed text book. Then answer the questions 1.1 to 1.5 that follow here below: 1.1 Name the four main symbols used to draw data flow diagrams (DFDs). (2) Half-mark each • Process • Data flow • External entity • Data store 1.2 Draw Diagram 1 DFD that shows the details of the FILL ORDER process in the ORDER SYSTEM (of Figure 5-13 on page 155) found on page 156 in Figure 5-14 of your prescribed book. NB: Only draw figure 5-14. (4) (Subtract ½ mark for each omission – lowest mark is zero) 3 1.3 Define each of the symbols you named in 1.1 and give any two names of examples of each in the diagram you drew in 1.2. Use a table, such as the one below to present your answer. (8) (One mark for the definition and ½ mark for each example) Symbol name Definition Examples Process A process receives input data and produces output that has a different content, form or both. --Verify order --Assemble order Or any other in diagram Data flow A data flow is a path for data to move from one part of the information system to another --Order - --Product detail Or any other in diagram External entity A person, place or thing, or event for which data is collected and maintained. --Customer --Warehouse Data store A data store represents data that the system stores because one or more processes need to use the data at a later time. --Products --Customers 4 1.4 Describe, in some details, what Levelling is in terms drawing DFDs. Then use Figures 5-13 and 5-14 on pages 155 and 156 respectively, to give an example of how this technique can be done. Do not draw the two figures. (5) The process of drawing a series of increasingly detailed diagrams (DFDs), until all function primitives are identified (or … to reach the desired level of detail). Example: One of the process in diagram 0 (Figure 5-16) is FILL ORDER. In order to fulfil an order, a number of other processes are required as shown in Figure 5-17. In this case, they are VERIFY ORDER and PREPARE REJECT NOTICE if the order is not successful or ASSEMBLE ORDER if the order is not rejected. During this processing a number of data flows and data stores may be used In awarding the above three marks, the student’s explanations are followed. There is no single correct answer. However, the idea should be the same. 1.5 Describe in some details what Balancing is in terms drawing DFDs. Then use Figures 5-13 and 5-14 on pages 155 and 156 respectively, to give an example of how this technique can be done. Do not draw the two figures. It is intentional that you do not use Figures 5-15 or 5-16 to answer this question even though the textbook uses these to explain the concept. (3) A process used to maintain consistency among an entire series of diagram