This volume is a guide for assessing children with dual sensory or severe impairments between birth and age 5. It begins by discussing a functional-ecological three-step assessment process for children birth to three years, and the steps for assessing preschoolers from three to five years old. It then describes six steps to guide the use of the assessment in developing interventions: (1) use a variety of formal and informal measures to develop a clear profile of the child's skills; (2) determine child and family outcomes as part of the Individualized Family Service Plan, or child objectives as part of the Individualized Education Program process; (3) link child's current profile with selected outcomes/objectives; (4) determine family/staff preferred times/events in daily schedule; (5) select routines for intervention within preferred times/events; and (6) conduct participation analysis for selected routines. The manual then discusses steps for guiding intervention processes. Appendices include a list of selected assessment tools, an evaluation and selection criteria rating form for prescriptive developmental assessment measures, a glossary of screening and assessment terms, the Infant Toddler Characteristic Profile, an example of objectives embedded in routines for activity-based intervention, and a mealtime/snack routine intervention. (Contains 110 references.) (CR)