THIS SOW DESCRIBES SOFTWARE DEVELOPMENT SUPPORT TO USE EARTH SYSTEM MODELING FRAMEWORK (ESMF) AND NATIONAL UNIFIED OPERATIONAL PREDICTION CAPABILITY (NUOPC) TOOLS TO COUPLE THE LAND INFORMATION SYSTEM (LIS) TO PARFLOW AND TO EXTEND THE NUOPC-COMPLIANCE OF THE DATA ASSIMILATION COMPONENT INSIDE LIS. IN ADDITION TO COUPLING THE PHYSICAL MODELS WITHIN LIS AND PARFLOW THE PROPOSED WORK WILL DEVELOP CROSS-MODEL COUPLED DATA ASSIMILATION INSTANCES INCLUDING NON-SEQUENTIAL ITERATIVE AND IRREGULAR TYPES OF COUPLING INSTANCES. THESE EFFORTS WILL ALSO ESTABLISH COUPLING PARADIGMS AND CONSTRUCTS WITHIN ESMF/NUOPC THAT WILL BE RELEVANT FOR THE LARGER ESM COMMUNITY.