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Presents the evaluation design and case study outcomes for 28 children (aged 3–5 yrs) from the 1st 3 yrs of the Ohio Early Childhood Intervention (ECI) project. The ECI project was designed to help build the capacity of professionals for intervention design. Capacity building refers to preparing educational systems for change and, specific to this report, providing valid conceptual and procedural guidelines for early intervention. The foundations of the ECI project are ecobehavioral analysis, ecological consultation, and naturalistic intervention design. The acronym PASSKey (Planned Activity, Strategic Sampling, Keystone behavior) describes 3 major aspects of the assessment-intervention guidelines. Validity evidence for the guidelines is based on single case quasi-experimental (accountability and case study) designs documented by comprehensive early childhood case portfolios. In addition, estimates were …