{milk MILK}, if the child said MILK); imitations ({more MORE}{milk MILK} if the child said MORE MILK); recasts (e.g. {more MORE}{milk MILK} if the child said WANT MILK); and models of the child’s actions (e.g. {more MORE}{milk MILK} if the child pointed to the carton of milk). Given the design of this investigation, it is not known whether certain types of models better facilitated the participants’ acquisition of multi- symbol messages.