“…The sub-field is, so far, dominated by a few theoretical approaches and empirical work on energy systems and water infrastructure, but the theoretical and empirical scope is broadening. Two distinct analytical perspectives have emerged as significant-the multi-level perspective and the innovation systems approaches-but increasing attention is being given to other sectors, technological fields, and geographical contexts, including outside the few Western countries that were initially in focus [40][41][42], processes, actors, networks, and innovation at local and global levels of organization [43][44][45], and also practices rather than sectors as a starting point [46,47]. The disciplinary backgrounds of scholars who engage in this sub-field are diverse, including the history of technology, sociology, industrial and evolutionary economics (the forerunners include Joseph Schumpeter [48] and Christopher Freeman [49], who focus on innovation and technological change and its diffusion as important factors of societal development) and management studies, geography, political science, and cultural studies (for overviews see [30,50]).…”