地址及来源
该笔记源于中国大学MOOC中张爽老师的《软件工程》。
地址：https://www.icourse163.org/course/NEU-1001812013#/info
1.1 Software Concept
Software History
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The 1st-generation computer, 1945~1957, Vacuum Tubes
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The 2nd-generation computer, 1958~1964, Transistor
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The 3rd-generation computer, 1965~1970, IntegratedCircuit
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The 4th-generation computer, 1971~present, Large scale Integrated Circuit----Personal Computer
Software Concept
- code in machine-readable form
- data (temporary and permanent data)
- All the documents
- Specification documents
- Design documents
- Legal and accounting documents
- Software project management plan
- All types of manuals
- Other management documents
Software Characteristics
- Software is abstract. It is a kind of logic entity,not concrete physical entity.
- Software does NOT wear out.
- Software is portable.
- Software is complex.
- Software is expensive.