Learner autonomy is a problematic term because it is widely confused with self-instruction. It is also a slippery concept because it is notoriously difficult to define precisely. The rapidly expanding literature has debated, for example, whether learner autonomy should be thought of as capacity or behaviour; whether it is characterised by learner responsibility or learner control; whether it is a psychological phenomenon with political implications or a political right with psychological implications; and whether the development of learner autonomy depends on a complementary teacher autonomy (for a comprehensive survey, see Benson 2001).