Self-directed learning is self-learning in which the student choses his materials and her directions (i.e. goals). Self-directed learning is the basis of the success and popularity of unschooling. The efficiency of self-directed learning is based on that, by definition, it is strongly influenced by the learn drive, and nearly always satisfies the fundamental law of learning. In a vast majority of cases, in homeschooling, parents quickly discover that self-directed learning is by far more efficient than learning based on a specific curriculum, however, in many countries, it is not legal to step away from the compulsory curriculum. Once parents free the kids of the rigid curriculum, homeschooling becomes unschooling, and the pleasure of learning helps the kids thrive.
See also: Self-directed learning of history