Partners in Play: Assessing Infants and Toddlers in Natural Context is a supplementary Text that has been written for students taking courses in Assessment and Early Childhood Special Education, as well as professionals in the field who work with families and young children, birth to age three. The text includes specific instructions for observing, administrating, scoring, and interpreting results of assessment, as well as two extensive illustrations from the field. In addition, the text includes a new criterion-referenced instrument used to identify infants and toddlers, birth through age three, who may be eligible for early intervention services. Partners in Play is a core assessment that has generated central information to the development of the Individual Family Service Plan (IFSP). The assessment is appropriate for evaluating infants and toddlers with a wide range of actual and suspected delays and abilities including children with environmental risk factors, children born prematurely, children with Pervasive Developmental Disorders, and youngsters with other neurological and/or developmental problems.