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There are two techniques being considered for carbon dioxide (CO2) removal and concentration for application in a regenerable Environmental Control and Life Support Systems (EC/LSS) aboard the projected Space Station. One uses the continuous Electrochemical Depolarized CO2 Concentration (EDC) technique while the second uses the cyclic absorption and desorption (with steam) from an amine resin bed. While the technologies involved with these techniques are substantially different, each must interface with other elements of a regenerable EC/LSS. This paper presents a comparison of the two competing technologies and includes the design and sizing of the respective subsystems for a Space Station application. The analysis includes identification of assumptions and groundrules with particular attention given to defining subsystem boundaries.