GENERALIZABILITY COEFFICIENTS ARE RELIABILITY COEFFICIENTS

Generalizability theory explicitly recognizes that multiple sources of error and true score variance exist and that measures may have differ ent reliabilities in different situations. Thus, it enjoys many advant ages over classic true score theory; however, it is relatively little used by social science researchers outside of educational psychology. This unfortunate situation has arisen, in part, because researchers do not realize that the coefficients of generalizability, which generali zability theory produces, are reliability coefficients. Labelling thes e coefficients as reliability coefficients should increase interest in , and the use of, generalizability theory.