CASCADE DISTILLATION SUBSYSTEM DEVELOPMENT TASKS - RECOVERY OF POTABLE WATER FROM WASTEWATER IS ESSENTIAL TO THE SUCCESS OF LONG-DURATION HUMAN SPACEFLIGHT. IN 2004, NASA GRANT NNJ04HF81G WAS AWARDED TO HONEYWELL, INC. TO PURSUE DEVELOPMENT OF THE CASCADE DISTILLATION SUBSYSTEM (CDS). THE CDS IS A WASTEWATER PROCESSING SUBSYSTEM BASED ON CENTRIFUGAL VACUUM DISTILLATION AND USES AN EFFICIENT MULTISTAGE THERMODYNAMIC PROCESS TO PRODUCE PURIFIED WATER. THE HONEYWELL CDS GRANT RESULTED IN SUBSTANTIAL TESTING THROUGH 2009 OF A HONEYWELL-PROVIDED CDS TEST STAND AT THE JOHNSON SPACE CENTER (JSC) ADVANCED WATER SYSTEMS DEVELOPMENT FACILITY (AWRSDF). IN 2009, U.S. PATENT #7610768 ENTITLED APPARATUS AND METHODS FOR WATER REGENERATION FROM WASTE WAS AWARDED IN RELATION TO CDS. IN 2010, A NASA-SPONSORED DISTILLATION TECHNOLOGY DOWN-SELECT COMMITTEE REVIEWED CDS RESULTS TO DATE, ALONG WITH OTHER DISTILLATION TECHNOLOGIES, AND RECOMMENDED NASA CONTINUE FURTHER DEVELOPMENT OF THE CDS. THE HONEYWELL GRANT CONCLUDED IN 2010. FOR FY 2011, THE NASA LIFE SUPPORT AND HABITATION SYSTEMS (LSHS) ORGANIZATION HAS IDENTIFIED THE FURTHER DEVELOPMENT OF CDS AS A JSC/EC3 WATER TECHNOLOGY DEVELOPMENT TASK THIS CONTRACTING ACTION ADDRESSES FURTHER DEVELOPMENT OF THE CDS. THIS JUSTIFICATION PROVIDES THE RATIONALE FOR CONTRACTING BY OTHER THAN FULL AND OPEN COMPETITION FOR TASKS TO SUPPORT THE TECHNOLOGY DEVELOPMENT OF THE CDS. THE NASA LSHS ORGANIZATION HAS IDENTIFIED THE FURTHER DEVELOPMENT OF CDS AS A JSC/EC3 WATER TECHNOLOGY DEVELOPMENT TASK FOR FY 2011. THE TECHNOLOGY DEVELOPMENT TASK IS TO INCLUDE THE MODELING OF THE CDS SUBSYSTEM AND THE ASSESSMENT OF THE FABRICATION OF THE THERMO-ELECTRIC HEAT PUMP (THP). COMPUTER MODELING OF THE CDS IS REQUIRED TO FURTHER UNDERSTAND THE STEADY-STATE PERFORMANCE OF THE CDS UNDER VARYING CONDITIONS. IN-DEPTH CDS-SPECIFIC DESIGN KNOWLEDGE AND CAPABILITY POSSESSED BY HONEYWELL IS REQUIRED FOR COMPLETING THE DESIRED TASKS. THE CDS DEVELOPER, HONEYWELL, HAS UNIQUE KNOWLEDGE AND EXTENSIVE DESIGN, DEVELOPMENT, AND OPERATIONAL EXPERIENCE WITH CDS TECHNOLOGY.