This document summarizes research from three open learning projects conducted by the Open University UK from 2006-2015. It describes how the number of participants or "colearners" grew from 50 to over 3,500 over the course of the projects. Through these projects, colearners collaborated to produce various open educational resources, including papers, book chapters, videos and more. The document also introduces a "C" model for visualizing the skills needed for colearning, such as being collaborative technologists, co-creators, and co-investigators. The model is intended to help analyze competencies for open and distance learning in the digital age.