Pre-adolescents and adolescents (N = 80, aged 10, 12, 15, and 18 years
) were tested on their knowledge of HIV/ AIDS. Knowledge was assessed
using a self-report questionnaire (examining levels of factual knowled
ge) and a semi-structured interview (examining cognitive developmental
levels of understanding). Examination of the developmental shifts in
understanding of HIV/AIDS revealed an increase in conceptual complexit
y on causal and prevention dimensions. The main conceptual changes inc
luded a shift from single cause to multiple cause solutions and a shif
t from identifying surface or immediate features to implicating less s
alient features. Additionally, with age, concepts about HIV/AIDS were
increasingly organised around internal, physiological principles. Ques
tionnaire responses yielded significant age-related increases in knowl
edge. Level of knowledge, as measured by the questionnaire, was higher
than that assessed by the interview for the three youngest age groups
. Thus, factual information acquired about HIV/AIDS is not automatical
ly accompanied by understanding. In light of these findings the past c
onclusion that adolescents have high levels of knowledge of HIV/AIDS i
s questioned.