Your new evidence does not have to support the old approach; you can use it instead to disprove standing approaches. Of course, this is more risky since readers tend to accept evidence for things they believe in and to be critical of evidence against things they believe in. If you decide to contradict existing approaches, you must have very strong evidence. An example of an article that would provide new evidence to contradict an old approach would be if you found that low self-esteem was not correlated with eating disorders. That is, although almost every researcher on the topic has found a strong correlation among low self-esteem, depression, and eating disorders, your test administered to undergraduate women did not find a strong correlation. You would be using new evidence to undermine an existing theory