软件工程Chapter 01 introduction.ppt

* * * * * * * * * * * * * * * * * 1.2 Software Engineering ethics Software engineering is carried out within a social and legal framework. there are areas where standards of acceptable behavior are not bound by laws but by the more tenuous notion of professional responsibility. Some of these are: Confidentiality You should normally respect the confidentiality of your employers or clients irrespective of whether or not a formal confidentiality agreement has been signed. Competence You should not misrepresent your level of competence. Intellectual property rights You should be aware of local laws governing the use of intellectual property such as patents and copyright. Computer misuse You should not use your technical skills to misuse other people’s computers. 1.3 Case Study Examples from three different types of systems are used throughout the book. An appropriate example is used when discussing concepts such as safety and dependability, system modeling, reuse, etc. An embedded system This is a system where the software controls a hardware device and is embedded in that device. An information system This is a system whose primary purpose is to manage and provide access to a database of information. A sensor-based data collection system This is a system whose primary purpose is to collect data from a set of sensors and process that data in some way. Case 1: An insulin pump control system Insulin pump hardware An insulin pump control system Activity model of the insulin pump An insulin pump control system Two essential high-level requirements that this system must meet: The system shall be available to deliver insulin when required. The system shall perform reliably and deliver the correct amount of insulin to counteract the current level of blood sugar Case 2: A patient information system for mental health care The MHC-PMS (Mental Health Care-Patient Management System) is an information system that is intended for use in clinics. It has two overall goals: To generat