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NSWInformation Processes and TechnologyQuick questions
Option: Decision Support Systems
Quick questions on Decision support systems and modelling in HSC Information Processes and Technology
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is what-if analysis?Show answer
What-if analysis changes the inputs of a model to see how the outputs respond. Asking what happens to profit if rent rises by ten per cent, or if sales fall by five per cent, is what-if analysis. Related techniques include goal seeking, which works backwards from a target output to find the input needed, and sensitivity analysis, which shows which inputs most affect the result. These let the decision maker understand risk and compare scenarios.
What are comparison with expert systems?Show answer
An expert system is a different kind of decision tool. It captures the knowledge of human experts as a set of rules in a knowledge base, and an inference engine applies those rules to reach a conclusion or recommendation, often with an explanation of its reasoning. A medical diagnosis system is a classic example. The key difference is who decides: a DSS provides information and models so a person decides, while an expert system itself produces a recommendation by reasoning over expert rules.
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