Evaluating the Biological Approach:
P - the model is supported by research into the genetic basis of abnormality
E - Holland found a 56% concordance rate with MZ twins for Anorexia and only 5% for DZ twins, suggesting that there is a genetic vulnerability to anorexia.
E - therefore suggests the model is reliable and valid
P - the approach also has a number of successful theraputic applications
E - chemotherapy is the most common form of treatment for psychological disorders in the UK
E - as the treatments are effective this must therefore suggest that the approaches beliefs about the causes and consequent implications are correct
P - however, although treatments are successful it is difficult to indicate cause and effect
E - High concordance rates between parents and children with disorder may not be due to genetic inheritance but social learning instead
E - therefore more research is needed to be able to draw consitent and valid conclusions
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