Mary Main, Disorganisation, and the MCAST.

I describe the development, with Ruth Goldwyn, Charlie Stanley and others, of the Manchester Child Attachment Story Task (MCAST); particularly highlighting the pivotal role that Mary Main played in its evolution, and its approach to attachment Disorganization. MCAST is a doll play vignette-completion technique characterizing attachment representations in young school-aged children (4.5-8.5 years). It uses a specific dyadic focus and adapts both Strange Situation Procedure (SSP) and Adult Attachment Interview (AAI) methods within its coding procedure, thus allowing a full detailed attachment classification including Disorganisation. I detail how Mary's prior work, insight and continuing support, along with Erik Hesse, in applying these coding systems to play narratives, was crucial to the successful development of the instrument. With selected research data, I then review some of the developmental and clinical issues that MCAST has subsequently addressed, reflected in a 2018 meta-analytic review of 25 studies investigating MCAST Disorganisation.