Necessary knowledge points of software engineering

chap1

1. What is software crisis

Software crisis refers to software Development and maintain A series of serious problems encountered in the process . Software crisis includes the following two problems ： Such as How to develop software , To meet the growing demand for heap software ; How to dimension Protect the expanding number of existing software .

Software crisis usually has the following typical manifestations ：1. Estimates of software development costs and schedules are often inaccurate ;2. Users are often dissatisfied with the completed software ;3. The quality of software products is often unreliable ;4. Software often does not have proper documentation ;6. The proportion of software cost in the total cost of computer has increased year by year ;7. The productivity of software development is far from keeping up with the rapid popularization and deepening trend of computer applications .

1. The cause of the software crisis

On the one hand, it is related to the characteristics of the software itself , On the other hand, it is related to the incorrect method of software development and maintenance .

1. Software is different from hardware , It is a logical part of the computer system, not a physical part , Therefore, it is quite difficult to manage and control the software development process .2. Software is different from general programs , Its remarkable feature is its large scale , And the complexity of the program will increase exponentially with the increase of the program size .3. At present, quite a few software professionals still have a lot of confused ideas about software development and maintenance , In the process of practice