Both for a borosilicate glass and a lithium-aluminium-silicate glass ceramic, it is found that quantitative predictions of the dimensional stability under thermal load are possible applying the semi-empirical Tool-Narayanaswamy-Moynihan model for structural relaxation, with the kinetic parameters obtained via DSC. This adds two systems to the list of materials for which the correspondence of the relaxation kinetics of volume and enthalpy have been investigated. (C) 2007 Elsevier B.V. All rights reserved.