Resumen: The secure-base phenomenon is central to the Bowlby/Ainsworth theory of attachment and is also
central to the assessment of attachment across the lifespan. The present study tested whether
mothers’ knowledge about the secure-base phenomenon, as assessed using a recently designed wordlist
prompt measure for eliciting attachment-relevant stories, would predict their children’s securebase
behavior, as assessed by observers in the home and summarized with the Attachment Q-set
(AQS). In each of three sociocultural groups (from Colombia, Portugal, and the US), scores characterizing
the quality of maternal secure-base narratives elicited using the word-list prompt procedure
were internally consistent, as indicated by tests of cross-story reliability, and they were positively and
significantly associated with the child’s security score from the AQS for each subsample. The correlation
in the combined sample was r(129) = .33, p < .001. Subsequent analyses with the combined
sample evaluated the AQS item-correlates of the secure-base script score.These analyses showed that
mothers whose stories indicate that they have access to and use a positive secure-base script in their
story production have children who treat them as a “secure base” at home. These results suggest that
a core feature of adult attachment models, in each of the three sociocultural groups studied, is access
to a secure-base script. Additional results from the study indicate that cross-language translations of
the maternal narratives can receive valid, reliable scores even when evaluated by non-native speakers.