Morris, T., Goulet, S., Morton, D. 2002. The International Symposium on Regulatory Testing and Animal Welfare: Recommendations on best scientific practices for animal care and regulatory toxicology. ILAR Journal 43(Supplement), S123-S125.

The key conclusion from the group's initial discussions was that enough information was now available to make robust recommendations for animal care best practices. Implementation, not information, is therefore the critical issue [p.123]... Well-implemented enrichment may reduce variability rather than increase it [p. 124].