Part 1 Biopharmaceutics: intravenous drug administration; intramuscular drug administration; subcutaneous drug administration; intraperitoneal drug administration; oral drug administration. Part 2 Animal characteristics: inbred strains and outbred stocks; male-female differences; changes during development and aging. Part 3 Maintenance of experimental animals: housing conditions; food composition; food and water intake. Part 4 Testing conditions: fasting; food restriction; circadian and other rhythms;anaesthesia; stress. Part 5 Import of experimental results.