Bieke Zaman Vero Vanden Abeele Laddering with young children in User eXperience evaluations: theoretical groundings and a practical case. 156-165 2010 IDC http://doi.acm.org/10.1145/1810543.1810561 conf/acmidc/2010 db/conf/acmidc/idc2010.html#ZamanA10