In 1969, the International League of Societies for the Mentally Handicapped issued its document "Residential Care for the Mentally Handicapped – Conclusions."
The document embraced a number of key concepts:
The Principle of Normalization is a sound basis for programming.
Residential services should be based on a developmental model.
The hospital model is inappropriate for residential services for most residents. The concept of lifelong institutionalization is inappropriate for the great majority of people with developmental disabilities
The importance of volunteers in minimizing the isolation of institutions and providing opportunities for meaningful interpersonal interactions.