Abstract
The article discusses some aspects of the concept of sustainable development and its educational manifestation - education for sustainable development. The concept of education for sustainable development is broadly accepted, but less attention has been paid to the extent to which innovations or changes are sustained over time, what characteristics or factors support their sustainability. The article introduces a model of six characteristics of sustainable changes in schools and changes concerning sustainable development in Estonian schools have been analyzed using qualitative research methods. The model consists of the following characteristics: depth, endurance, justice, diversity, conservation, and capital. According to the model, the positive changes in Estonian schools have been about the national curriculum, internal evaluation system as the basis for autonomy and self-management. The areas requiring greater change are justice or interdependence, diversity - respect for other people and the connections between formal and non-formal education as well as between schools and teacher training institutions.