This form of response is not merely the writer's opinion. However a writer chooses to respond, he/she should show the reader how and why he/she responded to the text as he/she did. Also, in crafting a response, writers don't have to focus on one or the other. They might find that they disagree with some of the author's points, but agree with others. In that case, their response will be a combination of agreeing and disagreeing. Whether they agree or disagree, or some combination of both, the writer must support their response with details, examples, facts, and evidence. Again, this support can take the form of personal experience, evidence from the primary text, or evidence from other texts.