They expolred the gradual development of attachments. They tested 60 babies in Glasgow. Visited monthly for the 1st year of their life and then at 18 months oldd. They considered two types of behaviour:
1. Seperation anxitey - if the baby is distressed when caregiver leaves them
2. Stranger distress - if baby showed signs of distress when a stranger approached.
They collected their data via observation and intereviews, asking mothers how babies behaved with babysiters - asked to rate baby's behaviour on a 4 point scale; 0 = no protest, 4 = crying loydly every time.
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