The Measure of Attachment Qualities (MAQ) is a measure of adult attachment patterns. It has separate scales to assess secure attachment tendencies and avoidant tendencies, and two scales reflecting aspects of the anxious-ambivalent pattern. This measure is based on four studies. Three studies relate self-reports of adult attachment qualities to broader aspects of personality. The pattern emerging from the studies indicates that avoidant attachment is inversely related to extraversion and to agreeableness but is relatively unrelated to manifest anxiety or neuroticism. Qualities of ambivalence (reflecting both worry and desire for merger) are related to both manifest anxiety and neuroticism but are unrelated to extraversion. An affirmatively secure attachment quality that emerged in the MAQ (i.e., as a separate factor, rather than by default as low scores on avoidance or ambivalence factors) was related positively to extraversion and agreeableness and was generally unrelated to anxiety or neuroticism. The final study also permitted comparison of the MAQ to a measure derived from a four-component model of attachment. Although there was considerable convergence, the data also provided challenges to both models.