Whatever procedure is in use, any adverse effects on animals must be recognised + assessed, + immediate action taken whenever necessary (responsibility of licenced researcher)
Where possible, live animals should be replaced with research alternatives (previous studies), like videos and computer simulations. Animals should only be used as a last resort.
Only minimum number of animals needed to produce valid + reliable results should be used. To minimize number, pilot studies, reliable measures of DV, good experimental design and appropriate data analysis should be used.
Research causing death, disease, injury, physiological or psychological distress or discomfort should be avoided. Where possible, designs which improve rather than worsen animals' experience should be used. Veterinary advice should be sought. Any distress or harm should be justified by scientific benefit (Batesons' cube)
Distress should be minimised during caging; social species need companionship + animals unused to other animals may be distressed if caged with them. Clean, sufficient food + water given, space to move freely, artificial environments must emulate aspects of natural environment