This policy brief puts forward an analytical framework to capture the nature, dimensions, and spectrum of innovation in the military and broader defense spheres. Insights are drawn from a range of disciplines, including history, social science, business, and strategic studies. The analytical framework is composed of six lenses through which to view the inputs, process, and output of innovation: 1) the components of innovation: technology, doctrine, and organization; 2) the capacity to innovate: that is, innovation potential; 3) the process of innovation: speculation, experimentation, and implementation; 4) the degree of innovation: from duplicative imitation to radical innovation; 5) the scope of innovation; and 6) systems of innovation.