procedure of the strange situation
1. observer leaves caregiver and infant alone in experimental room
2. caregiver watches child play and encorages it to explore
3. stranger enters, silent then talks to caregiver, then interacts with kid
4. 1st separation caregiver leaves the room, stranger tries to interact with kid
5. first reunion, caregiver comforts child, stranger leaves, caregiver then leaves
6. second separation, child = alone
7. stranger enters and tries to interact with child
8. second reunion caregiver comforts child and stranger leaves