The purpose of this study is to develop the Group Verbal Interaction Inventory (GVII), which is based on the findings of HIM-SS and HIM-B items. Four hundred group participants were selected to be samples in this study. Development of the GVII through content validity, coefficient of internal consistency, split-half reliability, test-retest reliability, and construct validity is detailed, and evidence for the reliability and validity of the instrument is presented. Based on the findings, suggestions and recommendations are made for group works and future studies.