This technical appendix supports Power to Change’s 2019 report on the community business market. It provides more information on the technical details of estimating market size for individual sub-sectors, and for the market overall. There are two appendices and a bibliography in this document. – Appendix A covers the survey and qualitative methods adopted in the primary research; – Appendix B details a revised and simplified model to estimate the size of the community business market, staffing levels and financial data. This incorporates how Power to Change’s own data was used.