The intention of the authors in this article is to contribute to the discussion concerning educational change by implementing the concept of social innovation. We argue that the application of the concept of social innovation makes it possible to better understand the process of implementation as well as sustainability and the social impact of educational changes. In the article, an integrated model of social innovation has been constructed and applied in conceptualising two consequent radical educational changes accompanying the post-communist changes in Estonia. As a result, the authors conclude that the concept of social innovation provides a promising framework, which facilitates the understanding and analysis of radical educational change. The social innovation approach is useful in identifying the different levels of change and assessing how deep the changes have been. However, in education systems in neo-liberal countries, where competition is one of the basic values, educational changes, even though becoming part of the everyday practices of actors, may redistribute power, rather than having an empowering effect for the majority of the main actors.