14 Software engineering sixth time operation

Why do you need to conduct a demand analysis? What are the general requirements for software systems? (Exercise 3 the first question)

(1) In order to develop products that truly meet the needs of users.

(2) A. Functional Requirements

B. Performance requirements

C. Reliability requirements and availability requirements

D. Error handling requirements

E. Interface requirements

F. Constraints

G. Reverse demand

H. Possible future requests

Can a program be both right and unreliable? Explain your answer. (Exercise 13, question 8th)

Yes. Software reliability is the ability of software products to complete the prescribed functions under the stipulated conditions and the specified time interval. (from Baidu Encyclopedia) and the correctness of the software refers to the system to meet specifications and user goals, that is, in a predetermined environment can correctly complete the desired function degree. (definition in Introduction to software engineering)

Therefore, when the software has an unknown failure, because it is not in the expected environment, so does not deviate from correctness, the default satisfies the correctness. However, reliability is not satisfied because the software does not respond appropriately, such as sending error reports.

14 Software engineering sixth time operation