Classrooms of 4-year-olds attending Head Start were randomly assigned
to an intervention condition, involving an add-on emergent literacy cu
rriculum, or a control condition, involving the regular Head Start cur
riculum. Children in the intervention condition experienced interactiv
e book reading at home and in the classroom as well as a classroom-bas
ed sound and letter awareness program. Children were pretested and pos
ttested on standardized tests of language, writing, linguistic awarene
ss, and print concepts. Effects of the intervention were significant a
cross all children in the domains of writing and print concepts. Effec
ts on language were large but only for those children whose primary ca
regivers had been actively involved in the at-home component of the pr
ogram. One linguistic awareness subtest, involving the ability to iden
tify the first letter and first sound of words, showed significant eff
ects.