<div class="htmlview paragraph">Future, potential developments in space transportation systems are reviewed. Consideration is given to spacecraft systems, launch and recovery facilities, and economic justification of future alternatives.</div> <div class="htmlview paragraph">It is concluded that requirements for high system utilization rates must be evolved before a fully recoverable, reusable space transportation system can be economically justified. The recovery and refurbishment of current-type systems is suggested as an intermediate alternative which, by reducing cost per mission and increasing space system utilization, will ultimately lead to a valid requirement for advanced reusable systems.</div>