Hi all. As I ponder the Mexican Cantina detailed example of SD U4O1 in the study design, I find the DFD increasingly interesting.<br><br>The case study says that the student's mobile software (call it system 1) writes an order to a text file.<br>
The other software (call it system 2) reads the text file and transmits it to the kitchen.<br><br>The question is: Is the text file a 'data store'? What constitutes a data store? <br>Does it need to be both written to and read to qualify as a data store?<br>
Does it need to be written/read by the <b>same</b> system?<br>Or can it be read/written by 2 systems?<br>
If it's only written by system1, and then left somewhere to be read by system 2, does it still count as part of system 1?<br><br>Therefore: Should the text file be shown as a data store in the DFD?<br>Should system 2 be shown as an external entity getting input from the text file?<br>
Will Saint Kilda get into the final 8 this season?<br><br>Draft DFD attached.<br>-- <br>Mark Kelly<br>Manager of ICT, Reporting, IT Learning Area<br>McKinnon Secondary College<br>McKinnon Rd McKinnon 3204, Victoria, Australia<br>
Direct line / Voicemail: +613 8520 9085, Fax +613 9578 9253<br>
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