Psychological involvement in the union

Based on data from 233 union stewards, we developed a five-item measure of psychological involvement in the union. Confirmatory factor analyses sugges ted that the scale is both unidimensional and distinct from union commitmen t. Correlation and regression analyses suggest that, after controlling for three dimensions of union commitment, psychological involvement in the unio n makes a unique contribution to the prediction of union-relevant criteria. Suggestions for the further development and use of the measure are offered .