2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147307Average properties of general inhomogeneous cosmological models are discussed in the Newtonian framework. It is shown under which circumstances the average flow reduces to a member of the standard Friedmann--Lema\^ıtre cosmologies. Possible choices of global boundary conditions of inhomogeneous cosmologies as well as consequences for the interpretation of cosmological parameters are put into perspective.7 pages, uuencoded gzipped ps-file, 68 kByte Proc. ``Mapping, Measuring and Modelling the Universe'', Valencia 1995, eds.: P. Coles, V. Martinez, M. Pons, to be published by ASP >>>changes of interpretation in Sects. 2.2 and 2.4Astrophysicstext