Book excerpt: WAFL is an international scientific conference on the assessment of animal welfare at farm or group level. Issues addressed during a WAFL conference can be: welfare criteria; welfare indicators and methods to analyse them; automation of measures; ways to deal with a large amount of data from various welfare measures in order to assess the overall welfare of animals; rationales underlying epidemiological studies and risk models; consultation processes; implementation in practice; communication of animal welfare assessment results; and other topics related to animal welfare assessment in practice.