An overview of the multicomponent systems for which isobaric (vapor + liquid + liquid) equilibrium (VLLE) data has been published, is presented. This overview comprises 36 ternary and three quaternary systems. For each one of these systems is specified a reference, pressure range, experimental method and the amount of equilibrium data determined. This is followed by a brief description for each experimental method of the specific procedure carried out to determine the (vapor + liquid) equilibrium in the case where the liquid is heterogeneous. Lastly, a final assessment is presented of the experimental procedures used to determine the (vapor + liquid + liquid) equilibria (VLLE). (c) 2010 Elsevier Ltd. All rights reserved.