The referential communication paradigm, which investigates the growth
of the ability to send and receive verbal information, is described an
d the current state of knowledge reviewed. In particular, the explanat
ions for communication failure are examined. Evidence from an internat
ional study is presented as an illustration of the difficulty that eve
n older elementary school children have in detecting ambiguity in mess
ages. It is argued that there is a case for the construction of a stan
dardized test in this area, given its importance in educational achiev
ement. The article concludes with a brief survey of work with language
-impaired groups and approaches to intervention.