Evaluating the stages of attachment: Good external validity (with counterpoint)
- Most of the observations made in Schaffer and Emerson (1964) were made by parents during ordinary activities and reported to researchers.
- If researchers had observed the babies rather than their parents, it may have distracted them or made them feel more anxious, therefore, it is highly likely that participants acted naturally while being observed.
- Counterpoint: However, there are issues with using the mothers as observers, as it is unlikely that they were objective.
- They may have been biased in what behaviours they reported and/or noticed. For example, they may not have known when the baby was showing anxiety, or they may have not remembered it.
- This means that, despite babies acting naturally, their behaviour may not have been accurately recorded.