Feminist commentators such as Worrell and Remer (have put forward a number of criteria that should be adhered to in order to avoid gender bias in research. Women should be studied within meaningful real-life contexts, and genuinely participate in research, rather than being the objects of study. Diversity within groups of women should be examined, rather than comparisons made between women and men. Finally, there should be greater emphasis placed on collaborative research methods that collect qualitative, as opposed to numerical, data.