One of the persisting aims in mathematics education is that students b
ecome more able in mathematical thinking. This article discusses relat
ions between research about processes of learning and thinking, and ed
ucational practices that attempt to achieve that aim. We discuss three
research perspectives that characterize thinking and learning to thin
k differently. The associationist/behaviorist perspective views learni
ng to think as acquisition of higher-order skills. The domain-structur
al/cognitive perspective views learning to think as acquiring schemata
and strategies for understanding and reasoning, with concepts in subj
ect-matter domains and with general principles of reasoning and proble
m solving. The situative perspective views learning to think as becomi
ng a more effective participant in social practices of inquiry and sen
se-making, in which individuals develop their identities as learners a
nd knowers. These views of thinking are reflected in educational pract
ices that emphasize acquisition of skills, conceptual understanding an
d thinking strategies, and participation in practices and development
of identity. The Middle-School Mathematics through Applications Projec
t is an example of learning environments, curricula, and teaching that
are designed with the situative focus. We argue that the topic of thi
nking provides an example in which the situative perspective can provi
de a framework that includes the strengths and values of the behaviori
st and cognitive perspectives.