The MCAST is a semi-structured doll play 'story stem' methodology, developed by Jonathan Green, Charlie Stanley, Ruth Goldwyn and Vicky Smith, to evaluate and understand the internal (mental) representations of their attachment relationship with a specific primary caregiver in children of 4 to 8.5 years. The concepts and procedures used have a basis in the Strange Situation Procedure and Adult Attachment Interview, and involves 4 story stem vignettes involving two dolls representing the caregiver-child dyad of interest and a dolls house, presented with affective arousal to mobilise attachment representations in a way that children of this age range find accessible and engaging. Responses are usually videotaped in order to reliably rate aspects of the child's represented narrative content and behaviour, and the child's own behaviour, to ascertain an attachment classification, with a particular focus on disorganised attachment, as well as providing other supporting ratings. Clinical development of the MCAST started in 1992, validation was published in 2000, and it has been since used in a range of cultural contexts and clinical and at-risk groups. Training is required for its use.