Karmiloff-Smith's model of representational redescription describes develop
ment proceeding from implicit to explicit knowledge. During part of this pr
ocess, knowledge is said to be resistant to external influences. However, a
study carried out by Messer, Joiner, Loveridge, Light & Littleton (1993) i
ndicated that peer interaction can assist progress at this phase. The prese
nt study investigates whether cognitive development can also be assisted by
adult interventions. The interventions involved structured tuition within
a participative framework, in relation to the task of balancing a beam on a
fulcrum. The study confirmed that knowledge introduced in this way assists
children at all levels. it was also found chat the representational redesc
ription model did not account for the behaviour of all the children. Additi
onal behavioural levels were identified, indicating the need for modificati
ons to the RR model.