Add to ORKGKey-points Models predicting intake and performance of grazing ruminants from animal, sward, grazing and supplements characteristics are rare, but they are now included in several decision support systems (DSS). An evaluation of the performance and accuracy of published models are rarely undertaken by their authors, but this is proposed in this paper. There is still a need for experimental research but also for the development of generic and dynamic models to predict intake and performance over a wide range of grazing conditions