E - Child generalises behaviour into natural environment. Six principles: parental involvement, comprehensive + developmental programming, compliance with ABA (Applied Behaviour Analysis) principles, seeing each child with ASD is unique, use of discrete trials, primarily home based. Steps: establish rapport with children, first skill: request something, then encourage imitation -> develop social skills. Effectiveness: by age 7, children with ASD/ developmental disorders were indistinguishable from peers socially, successfully integrated themselves + performed averagely academically