Responding to future challenges and societal needs, various actions are taken in agriculture to evolve towards more sustainable farming practices. These actionsimply strategic choices and suppose adequate sustainability as-sessments to identify, measure, evaluate and communicate sustainable development. However, literature is scarce on the link between strategic decision making and sustainability assessment. As questions emerge on how,what andwhen tomeasure, the objective of this paper is to construct a framework for guiding sustainability assessment and on-farmstrategic decision making. Qualitative research on own experiences fromthe past and a recentproject revealed four categoriesof actualneeds farmers,advisors andexperts have regarding sustainability assessment: context, flexibility, focus on farm and farmer and communication. These stakeholders' needs are then incorporated into a two-dimensional framework that marries the intrinsic complexity of sustainability as-sessment tools and the time frame of strategic decision making. The framework allows a farmspecificand flex-ible approach leading to harmonized actions towards sustainable farming. As this framework is mainly a procedural instrument to guide the use of sustainability assessment tools within strategic decision making, it fits to incorporate, even guide, future research on sustainability assessment tools themselves and on their adop-tion on farms.