procedure- M+I in room, I explore for 3 mins; S enters, sits 1 min, talks to M 1 min, plays with I 1 min; M leaves, S plays with I then withdraws, up to 3 mins; M returns, S leaves. M settles I and sits for 3 mins; M leaves I alone for up to 3 mins; S enters, attempts to settle I then withdraws, up to 3 mins; M returns, S leaves, M settles I and sits down; session ends