The Attachment Q-Set was developed for three reasons: (1) to provide an economical methodology
for further examining relations between secure base behavior at home and Strange Situation classifications,
(2) to better define (via a Q-set) the behavioral referents of the secure base concept, and (3)
to stimulate interest in normative secure base behavior and individual differences in attachment security
beyond infancy. As a first step toward further examining relations between secure base behavior
at home and Strange Situation classifications, Vaughn & Waters (1991) replicated the association reported
by Ainsworth et al. (1973). This illustrated a method that can be used to test the validity of
Strange Situation classifications across age, across cultures, and in clinical populations. The current
version of the Attachment Q Set is Version 3.0. It was written in 1987 and consists of 90 items.
Below is a complete list of the AQS items with descriptive information about the meaning and use of
each item. The “Rationale” for each item is for training only. When the q-set items are reproduced
on cards for use by observers, only the item content (“Item”, “Middle”, and “Low”) need be included.
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