Ecological systems theory assumes that child development is the consequence of ongoing reciprocal and spiraling interactions between the child and his/her microsystem (immediate home, school, and community environments). The increasing presence of digital technologies in children’s immediate environments suggests the need for the proposed theoretical techno-microsystem. The ecological techno-microsystem situates the developing child in the context of Internet use in home, school, and community environments. Preliminary validation of the ecological techno-microsystem requires description of children’s uses of the Internet across three environments and comprehensive measures of child development.