In order to achieve sustainable societies, we need models of behavior that go beyond individuals equating wellbeing and material consumption levels. Lowering individual footprints might be more acceptable once we include social relations, adopting responsibilities for other human and non-human life as well as civic engagement as complementary sources of wellbeing. Grassroots initiatives that stimulate collective action and social learning contribute to these diverse sources of wellbeing when striving to facilitate sustainable consumption. Thus, they can become role models for societal change. This review sets out to investigate why grassroots initiatives are created and developed successfully by focusing on the processes of founding, engaging in, developing and maintaining grassroots initiatives. We look at insights from different disciplines that address behavioral change and social learning to develop an overview of factors that are from an interdisciplinary perspective highly relevant to understand societal change processes. By means of organizing the analysis along three levels of human behavior – the individual level, the group level, and the societal level – we capture the multifaceted relationships influencing the success of grassroots initiatives. We present theoretical and empirical evidence connecting a broad spectrum of concepts that can subsequently be used as testable factors in fieldwork for in-depth investigations of grassroots success.