Investigate whether some vocabulary learning strategies are superior to others.
The first language develops naturally, not as a result of direct instruction, but by trial and error (Ellis, 125, 1997). The child tries a sound and looks for a response. Then the child tries to repeat the sound and looks for the same response. Eventually the child discovers that certain sounds are connected to certain responses, many of which fulfill the needs of the child, some which do little or nothing and some which get undesirable responses. Therefore, second language development should