Changes in child care caregivers' sensitivity and in children's attach
ment security were examined in three studies. Study one involved 55 ch
ildren enrolled in community based child care. There was no interventi
on in these sites. Caregiver responsive involvement and children's att
achment security did not change over time or when children changed car
egivers. Study two involved 71 toddler age children enrolled in family
child care homes. The caregivers of these children were enrolled in f
amily child care training project. Six months after the training secur
ity scores increased and caregivers of children who became secure or r
emained secure were more sensitive following training. Study three inv
olved 36 children enrolled in center-based child care. Children were o
bserved before and after selective staff replacement and in-service tr
aining to increase caregiver sensitivity. Six months following interve
ntion security scores increased and caregivers of children who became
secure or remained secure were more sensitive following training.