In this report, we present information about a newly developed, comprehensive, and integrated curriculum, STREAMin3, and findings from a pilot evaluation of this curriculum. STREAMin3 was designed for educators’ use in group-based settings serving children from birth to age five. Two research questions guided this pilot evaluation: 1. How well was STREAMin3 implemented? To answer this question, we tracked the exposure of teachers and children to multiple aspects of STREAMin3, the quality of curriculum implementation, and participants’ responsiveness to the curriculum. 2. Was STREAMin3 implementation associated with improvements in teaching practices? We used teacher surveys at the start and end of each implementation phase to determine whether and how STREAMin3 was associated with changes in perceived teaching practices and teacher-child interactions. (author abstract)