This evaluation is about the nature and magnitude of the cost savings and other benefits of business license simplification in one of the central districts of Lima, Peru. IEG asked whether the project’s license simplification reform reduced costs and operating procedures and whether it increased business registration. The project was implemented from 2005 to 2007. Two evaluations done in 2007 and 2008-11 examined, respectively, whether the project led to reductions in time and procedures and whether it led to improved business outcomes. This evaluation reviewed both of those, collected additional data, and drew lessons for future operations.