This 43-minute videotape demonstrates a six-step family-centered transdisciplinary arena approach to assessment and service plan development for young children with disabilities. The early intervention transdisciplinary team consists of the family and professionals from various disciplines, working together to share information and skills across disciplinary boundaries in assessment, program planning and implementation, and evaluation of progress. The arena model has one team member prepared and authorized to interact with the child and family to elicit a range of child behaviors while other team members observe. The six steps include: pre-assessment home visit, pre-assessment planning meeting, arena assessment, post-assessment review meeting, report writing, and debriefing. (JDD)