A teaching programme is reported in which critical thinking skills (in the
sense of reasoned justification of arguments; see Kuhn, 1991, 1993) were ta
ught. The principal aims of the study were to develop, implement and evalua
te a programme for teaching evidence-based justification to vocational educ
ation students in Further Education colleges. Teaching was via modelling an
d peer-based critiquing exercises in the context of the students' project w
ork. Eighty-four Further Education college students underwent a 10-session
teaching intervention which dovetailed with their Additional Assessment int
egrative project work. Students took part in peer-based exercises in which
they learned to critique imaginary examples of project outlines and plans,
followed by similar peer-based critiquing of each others' proposed projects
. Analysis of the students' dialogues with each other indicated that they h
ad learned the importance of justifying arguments, and content analysis of
their written work indicated that they engaged in justification of their ar
guments to a significantly greater degree than control groups. Several key
variables in the dialogues correlated positively with justification in the
written work, suggesting that the dialogue had impacted on the written work
. However, justification tended to be of a weak kind (using anecdotes or ex
perience-based generalisations), and strong (i.e. formal research-based) ev
idence remained relatively infrequent and sometimes inappropriately used. A
psychometric test of general critical thinking skills showed no evidence o
f transfer of learning.