Strength - Fewer confounding variables
P - Another strength of the Romanian studies is the lack of confounding variables
E - There were many orphan studies before the Romanian orphans became available to study (e.g. orphans studied during the second world war). Many of the children studied in orphanages had experienced varying degrees of trauma, and it is difficult to disentangle the effects of neglect, physical abuse and bereavement from those of institutional care
E - However, the children from Romanian orphanages had, in the main, been handled over by loving parents who could not afford to keep them.
L - This means that results were much less likely to be confounded by other negative early experiences and thus have higher internal validity.