This study reports the development of the Grievance Expression Scale (GES), a self-report measurement instrument of how organizational members express objections or complaints that they have about one another's behavior. The GES focuses on grievance expression as a precursor to conflict, and was developed in response to a lack of focus in current conflict instruments on conflict communication behavior and the influence of situational variables on that behavior. Additionally, the scale was derived from an interdisciplinary theoretical base, incorporating organizational conflict management research in communication, management, anthropology, and sociology. Four forms of the GES were administered to 830 currently employed adults waiting for jury duty and attending a city street fair. A four-factor scale was found, consisting of third party, confrontation, toleration, and discipline factors. Reliability, content, discriminant, and construct validity of the GES were supported. Further development should include tests of theory utilizing the GES.