This article reviews a number of studies over the last decades, which may contribute to a more coherent understanding of the complicated thermal behaviour of beta-lactoglobulin during heat treatments at pH > 6.8. Many research papers on P-lacto-globulin ignore studies published before the digital period, which means that useful information from the past has been lost or is repeated. In this review results of former studies are compared with recent research data in order to get a more complete and consistent overview over the temperature range up to 150 degrees C.