This final volume of the Asia Small and Medium-Sized Enterprise Monitor 2020 sets out ADB's work so far on a new composite index called the Small and Medium-Sized Enterprise Development Index (SME-DI) to help guide support for the development of micro, small, and medium-sized enterprises (MSMEs). The SME-DI aims to measure MSME development and access to finance using multivariate analysis of national MSME data. The volume includes the results of testing a pilot index using data from Southeast Asia.