What is the evaluation for Van Ijzendoorm's study on cultural variations?
:( not globally representative --> 27/32 studies from individualistic cultures --> need more data from socialist countries to establish global perspective --> ethnocentric --> low ecological validity
:( cultural relativism --> uses western method of measuring attachment --> US researcher testing on US infants --> should not be used in cultures where the same values are not as important
:) sample size --> 1900 infants --> high internal validity