In psychology, a construct, also called a hypothetical construct or psychological construct, is a tool used to facilitate understanding of human behavior. A psychological construct is a label for a domain of behaviors. Behavioral sciences use constructs such as conscientiousness, intelligence, political power, self-esteem, and group culture. For example, if a student sees another sitting in a classroom before an examination biting her nails and fidgeting, the interpretation might be that she is experiencing anxiety.[1] In that case, anxiety is a construct that underlies the behavior that is observed. Cognitive psychologists view constructs as hypothesized causes for certain behaviors, whereas behavioral psychologists view constructs as only descriptors of behaviors. A construct derives its name from the fact that it is a mental construction, derived from a process a observing natural phenomena, inferring the common features of those observations, and constructing a label for the commonality or the underlying cause. A construct derives its value from the shared meaning it represents for different people. If a construct is clearly articulated and the phenomena it encompasses are clearly defined, it becomes a useful conceptual tool that facilitates communication. Once defined, constructs become objects of conceptual scrutiny in their own right. Constructs summarize behavioral domains. Constructs are the building blocks of scientific theories.[1]