IGF::OT::IGF NASA GLENN RESEARCH CENTER (GRC) DEVELOPED THE ZBOT EXPERIMENT FOR OPERATIONS IN THE MICROGRAVITY SCIENCE GLOVEBOX (MSG) FACILITY ABOARD THE INTERNATIONAL SPACE STATION (ISS). ENGINEERING WORK WAS PREVIOUSLY CONDUCTED UNDER SPACEDOC-2 DO-204 AND MISSION INTEGRATION AND OPERATIONS (MIO) WORK WAS CONDUCTED UNDER DO-219. THE EXECUTIVE PRE-SHIP REVIEW-2 (PSR-2) WAS SUCCESSFULLY COMPLETED ON JANUARY 17, 2017, AND FLIGHT SYSTEM WAS DELIVERED TO THE INTERNATIONAL SPACE STATION (ISS) ABOARD CYGNUS SPACECRAFT FLIGHT OA-7, WHICH LAUNCHED ON APRIL 18, 2017. THE OPERATIONAL READINESS REVIEW WAS CONDUCTED ON JUNE 20, 2017. ZBOT IS A SMALL-SCALE SIMULANT-FLUID EXPERIMENT THAT WILL BE USED TO OBTAIN VALUABLE MICROGRAVITY EMPIRICAL DATA FOR CRYOGENIC STORAGE TANK PRESSURE CONTROL DESIGN AND ARCHIVAL SCIENCE DATA FOR MODEL VALIDATION. IT WILL BE USED TO BUILD A SCIENCE BASE FOR FUTURE SPACE STORAGE TANK ENGINEERING EFFORTS BY ELUCIDATING THE ROLES OF THE VARIOUS INTERACTING TRANSPORT AND PHASE CHANGE PHENOMENA THAT IMPACT TANK PRESSURIZATION AND PRESSURE CONTROL IN VARIABLE GRAVITY. THE PROJECT SCIENCE TEAM WILL DEVELOP, VALIDATE, AND VERIFY TWO-PHASE CFD MODELS FOR TANK PRESSURE CONTROL THAT CAN BE USED TO AID THE FUTURE SCALE-UP TANK DESIGN. ZBOT WILL SHOW THE FEASIBILITY OF A ZERO-BOIL-OFF (ZBO) PRESSURE CONTROL SCHEME FOR MICROGRAVITY AND VARIABLE GRAVITY APPLICATIONS BY EXAMINING THE EFFECT OF FORCED MIXING OF THE BULK LIQUID ON DESTRATIFICATION AND PRESSURE REDUCTION IN A VENTLESS DEWAR. THE SCOPE OF THIS DO INCLUDES POST-OPERATIONS ACTIVITIES INCLUDING THE POST-FLIGHT ASSESSMENT REVIEW (PFAR).