THE GOAL OF THIS EFFORT IS TO DEVELOP AN ENGINEERING DESIGN TOOL CAPABLE OF FACILITATING THE IMPLEMENTATION AND MISSION-INFUSION OF ELECTROSPRAY THRUSTER ARRAYS. THE ELECTROSPRAY THRUSTER ARRAY (ETA) ALTERNATIVELY CALLED MICRO-ELECTROSPRAY PROPULSION (MEP) IS CONSIDERED BY NASA TO BE A KEY ENABLING ELECTRIC PROPULSION (EP) TECHNOLOGY FOR SMALL-SPACECRAFT PROPULSION. THE PROMISING APPLICATIONS OF THIS TECHNOLOGY HAVE MOTIVATED A NUMBER OF EMPIRICALLY-DRIVEN EFFORTS THAT HAVE RESULTED IN SOME ETA PROTOTYPES WITH TRLS AS HIGH AS 6. THESE EXPERIMENTAL EFFORTS HOWEVER LARGELY HAVE NOT BEEN MIRRORED BY ADVANCES IN MODELING AND SIMULATION (M&S) CAPABILITIES. THIS CAPABILITY GAP REPRESENTS A SIGNIFICANT OBSTACLE FOR ESTABLISHING A CLEAR PATH TO FLIGHT FOR THIS PROMISING TECHNOLOGY. INDEED M&S IS AN INVALUABLE TOOL FOR ADDRESSING KEY SYSTEMS-LEVEL ISSUES SUCH AS THE PROBABILITY OF FAILURE MODES ISSUES WITH THE GROUND TO FLIGHT TRANSITION AND THE RISKS OF SPACECRAFT-PLUME INTERACTIONS. DEVELOPING MODELING AND SIMULATION TOOLS TO HELP ESTABLISH THE CAPABILITY OF ETAS FOR FLIGHT IS THUS OF THE HIGHEST RELEVANCE FOR THIS TECHNOLOGY. WE PROPOSE TO ADDRESS THE CURRENT CAPABILITY GAP IN ETA M&S CAPABILITIES BY DEVELOPING A NUMERICAL MODEL AND ANALYSIS ALGORITHMS TARGETED EXPLICITLY TOWARD FACILITATING ENGINEERING IMPLEMENTATION AND FLIGHT INFUSION. OUR APPROACH HAS THREE MAJOR ELEMENTS: (1)CREATING NEW MODULES IN THE STATE OF THE ART NUMERICAL MODEL FOR ELECTROSPRAY THRUSTERS THE ELECTROSPRAY PROPULSION ENGINEERING TOOLKIT (ESPET) TO REPRESENT KEY SYSTEMS-LEVEL ISSUES; (2) DEVELOPING EXPERIMENTALLY-VALIDATED REDUCED FIDELITY MODELS FOR THE UNDERLYING PHYSICAL PROCESSES THAT CAN BE INSERTED INTO THE PROPOSED MODULES; AND (3) APPLYING NOVEL BUT RIGOROUS STATISTICAL TECHNIQUES TO QUANTIFY THE PREDICTION UNCERTAINTY FROM THE IMPROVED ESPET. THE ULTIMATE GOAL IS TO CREATE A HIGHLY VERSATILE AND ROBUST MODEL CAPABLE OF PREDICTING KEY SYSTEMS-LEVEL FEATURES OF ETA PERFORMANCE. IF SUCCESSFUL THIS EFFORT WILL PROVIDE A NEW AND POWERFUL FOR ESTABLISHING A PATH TO FLIGHT FOR ETA TECHNOLOGY. OF MORE GENERAL INTEREST THE TECHNIQUES WE PROPOSE TO APPLY AND DEMONSTRATE ALSO COULD HAVE IMPLICATIONS FOR IMPROVING HOW MODELING UNCERTAINTY QUANTIFICATION IS PERFORMED FOR MATURE ELECTRIC PROPULSION SYSTEMS CURRENTLY PROPOSED BY NASA FOR DEEP SPACE EXPLORATION.