6. In Schaffer and Emerson's study, observations made were
- Made by the babies' mothers
- Made by researchers
- Recorded using CCTV
7. Multiple attachments appear
- At the same time as specific attachments
- After specific attachments
- Before specific attachments
8. Absence of observers meant Schaffer and Emerson's study
- Was very reliable
- Had high external validity
- Had high internal validity
