This publication contains a compilation of papers delivered at the Unemployment Insurance (UI) Expert System Colloquim. The indisputable progression of UI expert systems research is characteristic of the Federal-State partnership. Experiments conducted by State employment security agencies and funded by the U.S. Department of Labor have conclusively demonstrated the manifold uses of expert systems technology in the operation of UI programs. State employment security agencies? demonstrations have proven, for example, that expert systems can provide advice to claims staff in adjudicating UI issues and can determine employer coverage. Moreover, expert systems can advise a local office claims taker as to whether an individual qualifies for benefits under a State UI law or a combination of State UI laws. The demonstration projects developed under the research grants provided for by the U.S. Department of Labor and guided within ETA by the UI Expert System Advisory Group have proven the hypothesis proffered in 1983 by a small group of ETA UI professionals. This hypothesis-proven correct-is that expert systems technology can play a vital role in the delivery of UI benefits and services. During the next decade, the towering question of whether the expert systems will be inculcated into day-to-day UI operations rests in the hands of Federal and State policy makers.