Although geneticists realize the importance of twin studies in their field, many claim that not all experiments are reliable and credible. A large amount of geneticists claim that these studies are inefficient and the results, data, and information gathered from them must be utilized in a controlled manner.
One of the issues geneticists face is the idea that if two people (or a pair of twins) spend hours together comparing their personalities, life stories, and the way they act, it not not unlikely that they would encounter many coincidental correspondences. "If researchers created a control group of biologically unrelated pairs of the same age group, sex, and ethnicity who did not grow up together but who were as similar to one another in economic and cultural background as are separated twin pairs, wouldn't these pairs also exhibit striking similarities?" A reasonable response to this question would be that separated fraternal twins don't have as high of concordance rates as do separated identical twins.
The answers to many questions such as these have been concluded from continual persistent research, but not all have been answered. As more research is done on said topic, more issues arise, such as the fact that most twins that have been studied and were reared apart have been reunited for several years before the research was done, thus influencing the credibility of the information gathered. However, "twin studies illustrate why scientific thinking has shifted toward a greater appreciation of genetic influences."
Myers, D. G. (n.d.). Exploring psychology [pp. 66- 78]. Retrieved from http://books.google.com/books?id=bHvNT6qBtgYC&dq=twin+studies&source=gbs_navlinks_s
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