“…With their innovative approaches, they question the established systems and power structures therein, amplify irritations and may ultimately delegitimize the status quo [21,22,38,39,61,68,76]. When their advocates present realistic solutions to the instabilities, conflicts and tensions in mainstream regimes, radical niches can inform institutional reforms [20,33,57,77]. By diffusing critical knowledge and reflection, they can shift the agendas and terms of debate that are shaping future development possibilities, as well as the criteria used to assess the appropriateness of products, services and systems.…”