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Homework4_Shiwe_Li

Homework4_Shiwe_Li - CS487 Software Engineering Shiwei Li...

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CS487 Software Engineering Shiwei Li A20260374 Homework3 1. Textbook Exercise 21.9 The options are as followed: 1) Scrap the system completely, discard the old system’s maintenance, and adopt a new one to replace it. 2) Leave the system unchanged and continue with regular maintenance 3) Re-engineer the system, in order to improve its maintainability. 4) Replace all or some parts of the old system, and introduce a new system Normally, replacement would be a very good choice when maintenance is impossible or very costly and difficult to do. For example, you may want to choose replacement when the hardware has largely been replaced, so the software is ought to be updated together; or the customer want to discard the old system due to some big changes on business process; or the main or key components of the current system is changed; or the old system is very old and maintenance is worthless considering its low technology. 2. Textbook Exercise 21.11 I think this question really depends. Any software will need to have some evolved to some point but if it is a critical and steady process of business which wouldn’t change for quite a while or not easily changeable software engineers can think of skip this process or do it slightly. But in some real business organizations which need the software to evolve, the requirement might have implicit this but haven’t state it clear. However in this case if the engineer does not consider much on this point the software may not meet the requirements. However, real life business is different and software provider will have their own benefit and way of optimize profit so this problem is better to be state clear in the paper contract.
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