The three main ways of measuring attachment in adults include the Adult Attachment Interview (AAI), the Adult Attachment Projective Picture System (AAP), and self-report questionnaires. The AAI, AAP, and the self-report questionnaires were created with somewhat different aims in mind.
State Adult Attachment Measure (SAAM). The SAAM was developed by Gillath, Hart, Noftle, and Stockdale (2009) and is designed to assess state-like variation in working models of attachment. A copy of this measure can be obtained via Omri Gillath's web site.
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.
The Adult Attachment Scale (AAS) was officially developed in 1990 but built on the earlier work of Hazen & Shaver (1987) and Levy & Davis (1988). The scale was developed by decomposing the original three prototypical descriptions (Hazen & Shaver, 1987) into a series of 18 items.