The ROSRA tool helps local governments optimize their Own-Source Revenues (OSR). It quantifies revenue leakages and deconstructs known bottlenecks to identify root causes and entry points for reform. By supporting local revenue administrations in better understanding/communicating the weaknesses of their OSR systems, it facilitates strategic and resource effective interventions and helps to build reform momentum within local governments. The ROSRA tool ultimately strengthens the Municipal Finance foundations of local governments, enhances creditworthiness and thus enables local governments to leverage external resources to fund their development.