The term 'BIG MODEL' can be broken down into two crossword solutions: EMME (4 letters) and BIG (3 letters). EMME stands for the Environmental Modeling and Management Environment, which is a software platform developed by the US Environmental Protection Agency. It is used to create models of environmental systems and to analyze data related to environmental management. BIG stands for the Business Impact Group, which is an organization that provides consulting services to businesses on how to manage their operations in a sustainable manner.