Software Requirements Engineering: What, Why, Who, When, and How

As a beginner to the software field, one should know the importance of Requirement Engineering.
ABSTRACT 

If software requirements are not right, companies will not end up with the software they
need. This article will discuss:
•  What: The various levels and types of requirements that need to be defined 
•  Why: The benefits of having the right software requirements 
•  Who: The stakeholders of the software requirements and getting them involved in 
the process 
•  When: Requirements activities throughout the software development life cycle 
•  How: Techniques for eliciting, analyzing, specifying, and validating software 
requirements  
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courtesy: http://www.westfallteam.com/Papers/The_Why_What_Who_When_and_How_Of_Software_Requirements.pdf