In modern production systems, the most economically limiting diseases
are multifactorial enzootic health disorders. Relevant decisions in he
alth management have to be based on rational procedures. A first-level
approach implies the use of quantitative information on the economic
impact of the disease. A more relevant approach of decisions regarding
health problems consists of evaluating the economic worth of the inte
rventions in terms of cost-effectiveness. Decision analysis and decisi
on support are of interest today, particularly for herd health control
schemes regarding enzootic disorders.