evaluation of the stages of attachment study - weaknesses 1/2
small sample size and all the participants came from the same estate and area.
reduces the strength of findings and conclusions
cannot be generalised so lacks explanation of attachment development
also has low temporal validity - parenting techniques have changed since 1950s by the influence of bowlby's theory on attachment
child rearing practices vary from culture to culture and one historical period to another, so these findings can't be generalised to other social and historical contexts