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Quote:
For example, one topic given in GMATPrep is "the best teachers are those involve a lot of discussion". When I disagree, do I have to state explicitly what I think the best teachers are, or I simply discuss why we should NOT consider those the best teachers who involves a lot of discussion?
If you disagree, then you do need to talk about what quality does signify the best teachers. When essay prompts are worded in a way that gives only one particular opinion, often the easiest essay to write is one in which you agree with the statement. That way, you don't have to think about what quality DOES signify the best teachers.
Your task is not to ask yourself, "Hmmm, what do I really believe here?" That doesn't matter. Ask yourself how you can write the easiest possible essay for you. The best thing to do first is to brainstorm examples - any examples that apply to the situation, whether they agree or disagree with the essay prompt. As soon as you have two examples that support the same position, that becomes your position and you can write the essay. :)
Also, you don't have to give a counter-example. I never do; that's too complicated and I'm trying to make my life easy on the essays. You do need to "acknowledge the other side" but you can do that in your first and last paragraphs simply by saying something like, "Although it is true that discussion is an important component of any rigorous teaching curriculum, discussion is just one facet that the best teachers bring to the table in order to teach their students how to think critically. For example, ..."
Note: although I believe what I wrote above, I would never write it for a GMAT essay. That is a harder thesis to defend. It's much easier to think of a couple of examples that agree with the given opinion!
Also, you can redefine within reason. You still have to stick with the broad topic at hand, but you can define certain terms more narrowly or change the scope a bit as you see fit, yes.
They care most about whether you can (a) develop a coherent thesis, and (b) support that thesis with real-life examples. Concentrate on that and you'll be fine. :)