Birth - 5 years. The CHELLO is the only observation tool designed to rate the early literacy environment in home-based child care settings. A reliable, field-tested tool derived from the bestselling, classroom-focused ELLCO, CHELLO assesses environments that include children of different ages, from birth to 5 years. Use CHELLO to develop accurate profiles of materials and practices in family/group child care settings, help providers improve their literacy supports and interactions with children, and measure changes in the quality of environments over time. This set is the complete CHELLO and includes the Tool and a User's Guide with explicit instructions on conducting the observation, photographs that illustrate successful and unsuccessful environments, practical strategies to support literacy development in home-based settings, and the psychometric properties of CHELLO.