G. D. Saxton "et al." (2013) studied the role of community users, among other elements, during his content analysis of 103 crowdsourcing organizations. Saxton "et al." developed a taxonomy of nine crowdsourcing models (intermediary model, citizen media production, collaborative software development, digital goods sales, product design, peer-to-peer social financing, consumer report model, knowledge base building model, and collaborative science project model) in which to categorize the roles of community users, such as researcher, engineer, programmer, journalist, graphic designer, etc., and the products and services developed.