beta biasminimises/underestimates the differences between men and women.This occurs when female participants aren’t included as part of the research process and then findings are assumed to be applicable to both sexes equally.For example,the fight or flight response.Early research into this was based exclusively on male animals and was assumed to be an universal response to a threatening situation. Recently,Shelley et al(2000) have suggested that female biology has evolved to inhibit flight or fight response,shifting attention onto caring for offspring.