A key methodological issue associated with Rutter’s study is the focus on short-term recovery, rather than long-term rates. For example, just because a child adopted at the age of 3 years olds does not exhibit normal intellectual development at age 4, does not necessarily mean that the child is retarded or that they will not achieve normal development at a later point in their lives. Therefore, to increase the validity of the conclusions drawn, it would have been better to carry out the study across a longer time scale