Space is an important dimension of housing quality. Ample space for all household members can be defined in different ways (Indicator HC2.2 considers housing quality in terms of sanitary facilities). Several studies outline the negative effects of overcrowded dwellings on health and particularly on child outcomes (Eurofound, 2012; Solari and Mare, 2012). This indicator uses the average number of rooms per household member to illustrate how space constraints differ across countries and households within countries and overcrowding for an alternative measure of dwelling space that takes into account household composition. Rooms refer to bedrooms, living and dining rooms and in non-European countries also kitchens (see the section on Data on Comparability Issues for further details).