IELTS Writing Task 2: argument or discussion?

Simon at 

http://ielts-simon.com/ielts-help-and-english-pr/2013/10/ielts-writing-task-2-argument-or-discussion.html

argues that:

"Many people ask me about the difference between an 'argument' (opinion) essay and a 'discussion' essay. Here's an easy way to think about the difference:

• When you argue, you are trying to persuade the other person to agree with your point of view. You might even get angry!
• When you discuss, you consider different points of view, and nobody gets angry.

The question should make it very clear what it wants you to do. If it asks you to "discuss", you should write about both sides or two views.
If the question asks whether you "agree or disagree", it's asking for your view. For this type of question, give your opinion in the introduction and support it in the rest of the essay. Develop an argument that persuades the reader to agree with you. Note: you can have a strong view or a balanced view - it's your choice".