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An abstract o f the dissertation o f Michael Charles Leo for the Doctor o f Philosophy in Systems Science: Psychology presented June 16, 2006. Title: A Mixed-Methods and Multi-Level Investigation of the Effects o f a Crew Chief Intervention on Job Attitudes, Occupational Stress, and Organizational Commitment High-profile instances of workplace violence and increased pressure from competitors have threatened the viability of one of the nation’s largest employers, the United States Postal Service (USPS). As a result, the USPS began a massive change effort in the early 1990’s. One of the initiatives implemented to improve labormanagement relations was a derivative of the self-managed work team known as the crew chief program. This study provides a mixed-methods and multi-level approach to understand the impact this unique program had on organizational attitudes. The first aim o f this study was to investigate whether the crew chief program reduced employees’ stress and strain and improved job and supervisory satisfaction and company and union commitment, while controlling for the nesting of employees within sites and employee demographic characteristics. The second aim was to replicate and extend the stressor-strain-outcome (SSO) model o f stress and to determine whether employee perceptions of crew chief support moderated the relationships between stressors, strain, and outcomes.

A Mixed-Methods and Multi-Level Investigation of the Effects of a Crew Chief Intervention on Job Attitudes, Occupational Stress, and Organizational Commitment