Definitions of sustainability have till now failed to suit both concep
tual and operational purposes for lack of an appropriate analytical fr
amework that can be used by biophysical and socio-economic sciences wi
th equal ease. A framework for analysing sustainable land use is propo
sed which distinguishes between agro-ecological and socio-economic com
ponents and between different hierarchical system levels. In some deta
il the agroecological component is discussed in terms of changes in th
e stock of natural resources. Two decision-making levels with regard t
o land use, the farm level and the policy level are discussed in terms
of the trade-offs between agro-ecological sustainability and socio-ec
onomic objectives.