Organic farming is generally considered to be synonymous with sustainable farming and it has led the field in the development of farming systems and practices based on broad principles of financial, social and environmental sustainability. Nevertheless, the organic sector faces multiple sustainability challenges in the future; consumers are becoming more aware of the issues and food companies are accordingly more demanding, Government is requiring evidence to justify policy and grant support for organic farming and there is an urgent need for organic farming to deliver multiple objectives more effectively than it has done in the past. To merely fulfil the requirements of the organic regulation is not sufficient anymore. Organic producers are asked to deliver in-depth evidence of the sustainability of their farms.This evolution challenges not only the farmers, but also their advisers and certification bodies. In the past, advisory services focused in the first place on optimising production and profitability while improving the ecological and social status of the farms received much less attention. New societal demands now urge organic advisers to develop new tools to assess and improve the sustainability of organic farms across all fronts. STOAS project aims to make organic advisers, organic organisation managers and inspectors familiar with some of the recently developed tools and to provide practical training on sustainability to those working with farmers.