Sustainability, at its core, relates to the expenditure of resources. When we think about designing learning systems and experiences, various resources are tapped: time, expertise, information and more tangible materials such as devices or laboratory equipment. Think OER is free? Think again. Resource use always comes at a cost. This post explores a three-way partnership among designers, teachers and students that creates a Sustainable OER (SOER) model. Each partner has a role, a superpower and a site of accountability. This is how real partnerships, like the ones crafted by Mother Nature, survive. Thanks to lovely artwork from Claudio Purzlbaum (above), I'm reminded how important it really is to 'lend a hand.'