Kelly Services Incorporated. The Group's principal activity is to provide staffing services to a diversified group of customers. The Group operates through three segments: U.S. Commercial Staffing, Professional, Technical and Staffing Alternatives (PTSA) and International. U.S. Commercial Staffing includes office services, education, call center, technical support hotlines, light industrial staffing and telemarketing units. PTSA includes specialty staffing services from finance and engineering to information and health care, staff leasing, outsourcing, consulting, recruitment and general contractor services. International includes staffing services in North America, Europe and the Asia-Pacific region. U.S. Commercial Staffing accounted for 49% of 2002 revenues, Professional, Technical and Staffing Alternatives, 26% and International Staffing, 25%.