Extension theory has moved towards conceptualizations which illuminate
the power relationships inherent in extension practice. Consideration
of power relationships raises questions about the interests of the pa
rties involved and problems inherent in their conceptualization. Exten
sion theory has not yet tackled these problems, leaving the 'farmer fi
rst' and 'beyond farmer first' approaches as well as earlier top-down
models inadequate. This paper discusses the relationship between conce
pts of power and interests before raising some problems implied by int
erests. While interests are seen as essentially contestable and their
assessment. is seen as cultural construction, their analysis can be ba
sed on a pragmatic approach to human needs. A model which sees extensi
on as a power relationship steers it towards outcomes which emphasize
the enactment of power relations rather than behavioural objectives. T
he objective for extension becomes creation of a pluralistic arena in
which the assessment of interests of all parties is challengeable and
is challenged by all others.