`  :::::: Who is saying ``other approaches have an equivalent scientific pedigree to twin studies``? You said that, not I, and neither does the article. Therefore i am not obliged to justify their merits, nor am interested in spelling out the alternatives, as i (personally) do not think the section reqires such detail. Its simply important (in my opinion) to illustrate that twin studies are not the exclusive tool which scientists have used to find these suggestive associations. They may be the best, they may be the most common, but they are not exclusive. That is clear from the sources i provided.  ::::::Let me explain to you what happened. Without justification, Cesar deleted the bold text from this section:  ::The reasons offered for the relative lack of genetic understanding is because the links between genes and mental states defined as abnormal appear highly complex, involve extensive environmental influences and can be mediated in numerous different ways, for example by personality, temperament or life events. Therefore while twin studies and other research suggests that personality is heritable to some extent, the genetic basis for particular personality or temperament traits, and their links to mental health problems, is currently unclear  :::::: I replaced it because it is a more accurate, and informative, reflection of reality with it in. You questioned why. So I provided references. One of these references  says the following (my bold):  :: Twin studies show that co-morbidity within anxiety disorders and between anxiety disorders and depression is explained by a shared genetic vulnerability for both disorders. Some family studies support this conclusion, but others suggest that co-morbidity is due to one disorder being an epiphenomenon of the other.  :::::: Now, please tell me why the above reference, specifically the words in bold, is not an appropriate source for the assertion that i reverted? That is all i did and that is all i am interested in discussing. Should you feel you can further improve this section by rewording, then please do so. But please do not continue to infer greater meaning behind this very simple and justifiable edit. A little good faith would not go amiss. Thank you. e `