Inter-observer reliability is the extent to which two or more observers agree with each other. Researchers can help foster higher interobserver reliability if they clearly define the constructs they are interested in measuring. If there is low inter-observer reliability, it is likely that the construct being observed is too ambiguous, and the observers are all imparting their own interpretations. For instance, in Donna Eder's study on peer relations and popularity for middle school girls, it was important that observers internalized a uniform definition of “friendship” and “popularity”.  While it’s possible for multiple people to agree about something and all be incorrect, the more people that agree the less likely it is that they will be in error.