Krashen calls the natural, subconscious way of gaining a language:

1. Krashen separates two ways of developing a language. 2. One is natural, intuitive and subconscious, much like a child picking up a mother tongue. 3. He named this process **acquisition**; the other, conscious way is called learning. **Why not the others:** Monitoring is the checking of output with learned rules, and memorisation and translation are study methods, not the subconscious process. _Source: Wikipedia, "Input hypothesis", section "Acquisition-learning hypothesis" (revision 1380165607)_