An important principle for tests in the area of animal husbandry technology is to make the animal welfare requirements demanded by the Animal Welfare Act measurable. Indicators from the fields of ethology and animal health as well as physiological and performance, condition and hygiene parameters are used for this purpose. The relevant indicators are established by the Test Commissions in consultation with the DLG Expert Committee on Animal Welfare. Another feature of the tests is use on farms in order to make the effect on animals in practical use measurable and assessable.