wilson and smith focus on the relationships in later childhood
wilson and smith found out that insecure-avoidant infants are more likely to be bullied and insecure-resistant were more likely be bullies
wilson and smith did this through a questionairre
Bailey found that when he assessed 99 mothers/infants using the strange situation and interviews that they mothers had the same attachment type as their infants
a weakness is that they are only looking at causationship as they cannot control or manipulate it. Therefore can only use correlation but they cannot identify cause and effect and without that it cannot be classed as valid