ainsworth et al. (1971, 1978) procedure
- research room is a novel environment, often marked off into 16 square to observe the infant's movement
- contains eight episodes, each designed to highlight certain behaviours
- the caregiver and stranger alternately stay with the infant or leave
- this enables them to test separation anxiety, reunion behaviour, stranger anxiety and the concept of their secure base
- data is collected by a group of observers using a video recorder