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This paper contains a partial review of the requirements and design of the Environmental Control and Life Support System (ECLSS) for Space Station Freedom (SSF); a review of G189A ECLSS computer models developed for different SSF configurations; and some significant computed results from these models showing transient dew point responses during maximum and minimum dew point conditions on board SSF. SSF operational requirements which pertain to dew point have two major thrusts: 1) Quantification of high and low moisture contents allowable in the atmosphere; i.e., dew point within the range of 40°F to 60°F, and relative humidity within the range of 25% to 70%. 2) Prohibition of condensation on any interior surfaces (such as the interior pressure shell wall, or cool air/water lines) (1).* Detailed computational results presented in the paper pertain primarily to the verification of compliance with the first of the two items mentioned above.