By Ian Sommerville
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5 Software Engineering 9 – Solutions Manual Suggest appropriate reliability metrics for the classes of software system below. Give reasons for your choice of metric. Predict the usage of these systems and suggest appropriate values for the reliability metrics. • • • • • • a system that monitors patients in a hospital intensive care unit a word processor an automated vending machine control system a system to control braking in a car a system to control a refrigeration unit a management report generator See following table.
4 Why is it sometimes difficult to decide whether or not there has been a failure in a sociotechnical system? Illustrate your answer by using examples from the MHC-PMS that has been discussed in earlier chapters. The notion of a system failure is a judgment on the part of the observer of the failure, depending on their experience and expectations. Users of a system never read the specification so it is pointless to define failures as a deviation from a specification. For example, consider two users of the MHC-PMS from different backgrounds: 1.
For example, a university has a student admissions process and systems that support this are critical. They must be maintained. 2. They may incorporate organizational and business knowledge which is simply not documented elsewhere. For example, exceptions on student admissions may simply have been coded directly into the system with no paper record of these. Without this system, the organization loses valuable knowledge. 1 Suggest six reasons why software dependability is important in most sociotechnical systems.