THE OBJECTIVE OF THIS WORK IS TO STUDY AND PREDICT THE MICROSCALE PATTERNS THAT DEVELOP IN SOLIDIFICATION OF PURE AND ALLOY SYSTEMS IN MICROGRAVITY AND INVESTIGATE AND COMPARE THE EFFECT OF SOLID-LIQUID INTERFACE ANISOTROPY IN MICROGRAVITY AND TERRESTRIAL CONDITIONS. THE SURFACE AND INTERFACE FORCES CAN BECOME DOMINANT IN THE ABSENCE OF THE EARTH S GRAVITY AND TO ACCURATELY PREDICT THE DENDRITIC SOLIDIFICATION PATTERNS OF BOTH PURE AND ALLOY SYSTEMS IN MICROGRAVITY CONDITION COMPUTATIONAL MODELS NEED TO INCLUDE ACCURATE SOLID-LIQUID INTERFACE ENERGY AND ANISOTROPY; HOWEVER SUCH DATA ARE NOT AVAILABLE FOR SEVERAL MATERIALS AND/OR NOT INCLUDED IN PREVIOUS COMPUTATIONAL MODELS OF SOLIDIFICATION PATTERNS IN MICROGRAVITY CONDITION. IN THIS WORK A MULTISCALE COMPUTATIONAL FRAMEWORK INTEGRATING MOLECULAR DYNAMICS SIMULATIONS AND PHASE-FIELD MODELING WILL BE UTILIZED TO QUANTITATIVELY PREDICT SOLID-LIQUID INTERFACE PROPERTIES AT THE NANOSCALE AND USE THESE DATA TO PREDICT SOLIDIFICATION PATTERNS AT THE MICROSCALE.