The first 1 Chapter An overview of software engineering

What is software

• Software = Program + data + file + knowledge

The concept of software crisis 、 performance

• Software crisis refers to a series of serious problems encountered in the development and maintenance of computer software .
• Typical manifestations of software crisis are
  • Estimates of software development costs and schedules are often inaccurate .
  • The user to “ Completed ” Software system dissatisfaction often occurs .
  • The quality of software products is often unreliable .
  • Software is often not maintainable .
  • Software usually doesn't have proper documentation .
  • The proportion of software cost in the total cost of computer system is increasing year by year .
  • The speed at which software development productivity increases , Far from keeping up with the rapid popularization and deepening trend of computer applications .

The causes of software crisis and the ways to eliminate it

• reason ：
  • Lack of software “ visibility ”, The progress of the development process is difficult to measure , The quality of software is also difficult to evaluate , Managing and controlling the software development process is quite difficult .
  • The software scale is huge , Program complexity will increase exponentially with the increase of program size .
  • It is difficult to divide work and cooperate .
  • Despise maintenance .
• The way to eliminate the crisis ：
  • Do a good job in defining the software period
  • The successful techniques and methods of developing software summarized in practice should be popularized , And explore more effective technologies and methods .
  • Better software tools should be developed and used .
  • All in all , To solve the software crisis , Both technical measures should be taken （ Methods and tools ）, And necessary organizational and management measures .

The concept of software engineering 、 Essential characteristics 、 The basic principle

• Software engineering is an engineering discipline that guides the development and maintenance of computer software .
• Essential characteristics ：
  • Software engineering focuses on the construction of large programs
  • The central task of software engineering is to control complexity
  • Software changes all the time
  • The efficiency of developing software is very important
  • Harmonious cooperation is the key to developing software
  • Software must have users who effectively support it
  • In the field of software engineering, people with one cultural background usually create products for people with another cultural background
• The basic principle ：
  1. Strict management with phased life cycle plan
  2. Insist on stage review
  3. Implement strict product control
  4. Using modern programming technology
  5. The results should be clearly examined
  6. The development team should have fewer and better people
  7. Acknowledge the need to continuously improve software engineering practices

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• Full version document source address ：https://github.com/ZSYcho/SoftwareEngineer
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