The term requirement has been in use in the software engineering community since at least the 1960s.
According to the Guide to … 展开

Requirements can be said to relate to two fields:
• Product requirements prescribe properties of a system or product.
• Process requirements prescribe activities to be performed by the developing organization. For instance, … 展开

Requirements are usually written as a means for communication between the different stakeholders. This means that the requirements should be … 展开

Competing standards
There are several competing views of what requirements are and how they should be managed and … 展开

Requirements are typically classified into types produced at different stages in a development progression, with the taxonomy depending on … 展开

The characteristics of good requirements are variously stated by different writers, with each writer generally emphasizing the characteristics most … 展开

Requirements generally change with time. Once defined and approved, requirements should fall under change control. For many projects, requirements are altered before the system is complete. This is partly due to the complexity of computer software and the fact that users … 展开