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I am frequently asked to provide information, white papers and framework documents to describe some of the intricacies of the space. We at Fundamo developed very good collateral during the past ten years. We use this collateral to the benefit of our clients and our partners. We have made some of this content available to parties in the industry, but do not usually share it openly.
I would like to recommend a very good research paper in this regard. It is a document produced Rasheda Sultana from the Grameen Foundation, and explains many of the concepts well. While, I have some reservations on some of the conclusions and information in the document, I can recommend a read, especially because it is available on the Internet for free. (Download here).