The ECWG developed guidelines to support researchers, stakeholders, and program implementers to collect and analyze data on program costs and estimate program cost-effectiveness, with the goal of supporting better practices in cost data collection and the use of these data to inform future investments in women’s groups. The ECWG has also designed two versions of cost data collection tools – a basic version and an advanced version. These tools can be used to collect cost data of women’s group programs by defining program-specific assumptions (also included in the tools). The cost data collection tools are accompanied by one cost summary and analysis sheet, which can be used to generate cost-effectiveness estimates based on total costs and estimated impact.