Strength)Good reliability
->A team of trained observers found agreement on attach type in almost all cases. This high level of reliability may be because the procedure is done in controlled conditions.
Limitation)Not a valid measure of attachment in different cultural contexts.
->S.S was made in US, by US standards. A baby from Germany may be tested as insecure-avoidant because of the culture they were raised in but in Germany it wouldn't be classed as that because those characteristics are desired and nurtured in babies.