A primary goal of this project was to develop an interface that would provide direct access for inexperienced users to existing online bibliographic information retrieval networks. The experiment tested the concept of a virtual-system mode of access to a network of heterogeneous interactive retrieval systems and databases. An experimental translating computer interface named CONIT, that enables the virtual-system mode, was developed as a research test vehicle. The interface was designed to make the basic functions of three different bibliographic retrieval systems easy to use, even by inexperienced end users, by providing a simplified common command language coupled with extensive online instruction. Analysis of controlled experiments with end users indicates the probable success of operational interfaces using the virtual-system principle and other techniques demonstrated in the experimental interface. The research has also suggested that certain techniques implementable on an interface could enhance retrieval effectiveness for a wide class of users by aiding them in the development of search strategies. A project bibliography and references are included. (Author/RAA)