As shown in table 1, we will be cognizant throughout of who the learners are, where they learn, how they learn, what are the principal curricula, and how competences are purveyed via the media of the time. The grid itself contains generalizations about the past and present, and speculation about the future, thus providing a broad portrait of changes over time. While we do not discuss each entry in the grid, we hope that it aids in thinking about learning in formal and informal settings.