This tool allows visualization of the potential CO2e captures of NAMA activities in Colombia in 2018-2050, by creating scenarios based on specific NAMA activities that possible in each region of the country, project areas, and time frames. The present report summarizes the NAMA activities included in the tool and how their potential CO2e captures are calculated, while guiding the user through the different components of the tool. The NAMA Decision Support Tool is user-friendly and can be developed for other countries interested in having a better understanding of the potential benefits of their NAMA strategy.