Another factor that my classmates and I thought is the most important factor in second language acquisition is motivation. It is logic to say that learners, who are motivated, will learn more and faster than those who are not. In fact, Gardner states that “Motivation involves four aspects, a goal, effortful behaviour, a desire to attain the goal and favourable attitudes toward the activity in question” (1985, p. 50, in Gass S. and Selinker L., p. 350). However Brehm and Self argue that effort is considered to be a result of motivation, not a component (in Gass. S and Selinker L., p. 351). I think that the important point is that motivation is a huge factor of Second Language Acquisition (maybe not the most important), and can affect in different ways in each learner.
M. Glass, S., & Selinker, L. (2001). Second language Aquisition(An introductory course. (2nd ed.). Mahwah: Lawrence Erlbaum associates Inc.
Allwright, D., & Bailey, K. M.. (2006). Focus on the Language Classroom. (tenth ed.). Cambridge: Cambridge University Press.