This dataset includes the Model Development Infrastructure (MDI) files and additional datasets for crops, livestock, land, and solid waste. The MDI is a modular, excel-based toolkit that organises and structures input data in a format that is optimised for OSeMOSYS. The files are are arranged in a chronological sequence forming a step-by-step process. The excel sheets includes data sources and calculations used for modelling Laos' Climate, Land, Energy and Water systems (CLEWs). Please note that although Tool 04 and Tool 07 are attached as part of the MDI, they were not used in this study.