- theory has negative implications for working mothers (social sensitivity)
- cupboard love: alternative explanation of attachment that the environment not biology creates attachment
- lorenz: lacks external validity/ generalisability as the study focuses on geese not human attachment - they're different in evolutionary terms
- kagan 1984: a child's personality affects how a child forms relationships whether they're securely or insecurely attached
- lacks temporal validity as there's alpha bias as it suggests that women should be the primary care giver and the father should provide. in modern society men are expected to do an equal amount of childcare compared to women