1. Fred Ochieng Walumbwa, University of Nebraska—Lincoln, Department of Management, Lincoln, NE 68588 0491, USA (tel: ; fax: ;).
2. John J. Lawler, Institute of Labor and Industrial Relations, University of Illinois at Urbana-Champaign, 504 East Armory Avenue, Champaign, IL 61820, USA (tel: ; fax: ;).