The present invention provides an Attachment alignment measurement system, method and tool, for identifying the level of Attachment Variance in a relationship between a caregiver and a subject (e.g. new member) in the social structure. Attachment Variance is the degree of alignment (or misalignment) between a subject's (e.g. new member) actual Attachment to the social structure compared with the Attachment of the subject as perceived by the caregiver. The Attachment alignment measurement method for measuring attachment variance in social structure, including the steps of measuring a Subject's actual Attachment to a social structure (Actual Attachment), measuring a primary carer's perception of the Subject's Attachment to a social structure (Perceived Attachment), and comparing Actual Attachment and Perceived Attachment such that Attachment Variance is assessable, wherein Attachment Variance provides an indication of alignment between a Subject's Actual Attachment the Perceived Attachment and the programming instructions for performing the steps.