Issues about requirements elicitation have been an ongoing problem area since the very earliest days of computing. However, incorrect requirements, misunderstood requirements, and many other requirement problems are still present in systems development projects. The purpose of this chapter is to look at the causes of problems in requirement elicitation process. We will look at these problems from the human perspective, trying to understand the role of human cognitive, emotional, motivational, and social processes. Our goal is to understand the aspects which should be taken into consideration when choosing requirement elicitation approaches and methods.