CSBS DP is an easy-to-use, norm-referenced screening and evaluation tool that addresses communicative behavior and symbolic development. Derived from CSBS, CSBS DP is shorter, faster, and lets professionals begin identification earlier--6 to 24 months (functional communication age) or 6 months to 6 years (chronological age). It's an ideal starting point for planning IFSPs, evaluating interventions, documenting changes in a child's behavior, and identifying areas for further assessment. CSBS DP includes - Infant-Toddler Checklist. In 5-10 minutes, caregivers answer 24 multiple-choice questions grouped into seven language predictor clusters: Emotion and Eye Gaze, Communication, Gestures, Sounds, Words, Understanding, and Object Use. Then, a professional combines the clusters to yield scores in three composite categories: social, speech, and symbolic. - Caregiver Questionnaire. Caregivers take 15-25 minutes to complete this 4-page questionnaire, which measures in more detail the same seven clusters. - Behavior Sample. The sampling procedure, conducted by professionals, streamlines the one in CSBS to 30 minutes. CSBS DP measures 20 scales that comprise the social, speech, and symbolic composites, and professionals judge the presence or absence of 20 types of behaviors, recording them on the 1-page Scoring Worksheet. - Caregiver Perception Rating Form. This 1-page form asks caregivers to compare the child's behavior during the assessment to the child's typical behavior. - Manual. Includes complete instructions and technical data. - Toy Kit. Includes familiar toys, books, and other play materials. - Videos. Demonstrate how to collect a Behavior Sample and completescoring worksheets.