limitation -lacks validity
-concept of monotropy lacks validity
-Schaffer and Emerson found that, although most babies attach to one person first, most form multiple attachments at the same time. one with primary may be stronger than others rather than different in quality as bowlby believed.
-other family members may have similar relationships (secure base behaviour)
-bowlby may have been wrong to suggest that there is a unique quality to a child's primary attachment