A critical concept for second-language development for students with and without learning difficulties is comprehensible input.Comprehensible input means that students should be able to understand the essence of what is being said or presented to them.This does not mean, however, that teachers must use only words students understand. In fact, instruction can be incomprehensible even when students know all of the words. Students learn a new language best when they receive input that is just a bit more difficult than they can easily understand. In other words, students may understand most, but not all, words the teacher is using. Read more on TeacherVision:http://www.teachervision.fen.com/learning-disabilities/bilingual-education/10260.html#ixzz1y1HtXoBR