Culture shapes child-teacher interactions and classroom practices in early care and education. It also shapes how to appropriately define and measure them. This webinar features program staff and researchers from two policy-research partnerships, one from a state and one from a Tribe. They share lessons learned about better supporting, defining, and studying child-teacher interactions. The webinar includes: a presentation on fostering, measuring, and studying culturally responsive child-teacher interactions for Indigenous children in Alaska early care and education programs; a presentation on fostering, measuring, and studying responsive child-teacher interactions to improve infant and toddler language and learning in Georgia early care and education programs; a period of questions and answers with the webinar audience. (author abstract)