This report presents a review and evaluation of three remote access on-line information retrieval systems and some ideas on what the capabilities of an ideal on-line information retrieval system should be. The three systems reviewed are the DDC Remote On-Line Retrieval System, the National Aeronautics and Space Administration RECON System, and the Technical Information Program (TIP) of the Massachusetts Institute of Technology. The DDC system is examined in detail for two reasons. It is the newest of the three systems and reflects many of the latest advances in the utilization of on-line capabilities for information retrieval. It is currently in use at the Naval Ship R&D Center (NSRDC), and the author has had direct personal experience in its use and development. Each of the three systems is reviewed on the basis of its operation during the last quarter of 1969. This paper does not reflect changes in the systems which have occurred since then. The final section is devoted to suggestions for exploiting the potential of on-line remote access information retrieval and display systems. (Author/MM)