control refers to the extent to which people believe that their success and failure is determined by external sources, such as by mere luck (that he/she is just lucky) or by other people. It is a belief that reinforcement is under the control of other people, fate, or luck. Moreover, External locus of control is a perception that other persons or events are responsible for one’s fate.
validity of a measure, such as an index or scale, by examining its relationship to other, presumed indicators of the same variable. If the index really measures prejudice , for example, it should correlate with other indicators of prejudice.