Since the introduction of one-stop employment systems, many states have attempted to merge traditional employment and training services to provide consolidated programs and easier customer access to services. The Workforce Investment Act (WIA), passed in 1998, requires the formation of locally based one-stop service delivery systems to deliver many federally funded employment and training services. Four principles have guided development of the one-stop system: universal access, customer choice, service integration, and accountability. In contrast to the Job Training Partnership Act, which focused on providing training to economically disadvantaged individuals, the WIA requires delivery of one-stop services at three levels: core services, intensive services, and training services. Core services, which must be made available to all interested individuals, include access to career information resources. Intensive services include counseling, case management, and short-term prevocational services. Training services are reserved strictly for individuals who are unable to benefit through core and intensive services, with priority given to public assistance recipients and low-income individuals. The following are among the issues related to further development of the one-stop system: universal access to core services; collaboration with the welfare system; assessment of services; and serving employers. (Contains 10 references.) (MN)