The document outlines the terms of reference for a working group jointly advancing decision support tools through development partners. The working group aims to 1) gain efficiency by joining efforts and expertise, 2) ensure tools address user needs by incorporating early-stage input, and 3) accelerate scaling and adoption through co-development. Co-development is expected to generate trust in recommendations, buy-in and ownership of tools, promotion of tools by partners, and use of tools in partners' primary activities. The working group will leverage partners' ongoing activities and contributions while ACAI's contribution is limited. Five sub-groups are established with facilitators to summarize discussions, update documents, and represent the group.