To be instrumentally rational is, roughly, to take necessary
and effective means to one’s end. For instance, if you decide to give up
smoking, it would be instrumentally rational to stop buying cigarettes, and to
limit the time you spend around other smokers. It would be irrational not to
take any means to this end. Instrumental rationality raises several sets of
questions, including: (i) what are the principles of instrumental rationality?
(ii) what is the normative status of the principles of instrumental
rationality? (iii) might instrumental rationality be all of practical