This document provides details on a federal solicitation from the US Agency for International Development for accountability and governance services. Solicitation number SOL-OAA-17-000103 seeks offers for the ACES program, which provides an accountability systems approach to strengthen linkages between formal institutions and citizens. The program aims to integrate good governance principles across USAID development sectors such as health, education, and economic growth. This involves applying democracy, rights, and governance practices to address political and economic obstacles and improve overall outcomes. Offerors are invited to provide services that support understanding citizen interactions in accountability systems and processes while strengthening connections among formal and informal actors on specific issues.