Sentence:  <WSD>Family grouping</WSD>, as Elsa Ferri pointed out in her study of combined nursery centres (Ferri etal., 1981), similarly carries an element of wishful thinking. What could be less like the average family in the 1990s than up to ten shildren of different ages spending all day in the same room in the charge of one or two young nursery workers? 
Meaning of the word marked with <WSD> tags:  The system of grouping children of differing ages together, used primarily at the preschool level.