Fewer confounding variables
- There have been many studies on institutionalised children like those from WW2
- However, many of those children had experienced varying degrees of trauma from physical abuse, bereavement and neglect.
- This makes it hard to distinguish the problems of institutions.
- In contrast the children that partook in the Romanian orphan studies were handed over by loving parents who couldn't afford to keep them
- This means the results are much less likely to be confounding by other negative early experiences increasing the overall internal validity.