Asocial stage (0-6 weeks): babies show similar responses to inanimate objects and people
Indiscriminate stage (6 weeks-6 months): infants can distinguish between familiar and unfamiliar people but will accept comfort from anyone
Specific stage (7 months+): infants show a preference for one caregiver; looking to them for security, comfort and protection. Infant will display separation anxiety when the person they have formed a specific attachment to leaves the room. They start to display stranger anxiety particularly when the primary attachment figure is missing
Multiple attachments stage (10 months+): the infant will show separation anxiety to secondary attachments
There is conflicting evidence to suggest that children are able to form multiple attachments from the outset, especially in collectivist cultures where the infant forms multiple attachments to wider family members
He collected data using naturalistic observations. Parents and children were observed in their own homes, and most of the observations were done by the parents themselves during ordinary activities and reported back to Schaffer. This means that children would have been unaffected by the presence of observers and behaved naturally. This means that the results can be generalised to real life and therefore the study has high ecological/external validity
Schaffer's research discovered that the infant will form an attachment with whoever is the most sensitive and responsive to their needs - responding to their signals with the most skill
This will have positive implications for the economy as she will be earning and spending money. If she places the child in day-care this also creates more jobs generating money for the economy