Four experiments were carried out to assess effects of product warning
explicitness on purchase preferences and caution in use. Explicitness
was defined as the specificity or detail with which potential injury
consequences were described. All experiments employed a paradigm in wh
ich warnings varying in explicitness were described for familiar produ
cts. Subjects rated various perceptions of the products, purchase pref
erences, and intent to act cautiously in using the product. Results in
dicated that more explicit warnings were associated with greater level
s of perceived dangerousness, hazard understanding, injury severity, a
nd manufacturers' concern. While explicit warnings were also associate
d with an increased intent to act cautiously in using products, no cle
ar relationship was found between explicitness and purchase preference
s. It is recommended that product warnings should be explicit regardin
g injury consequences, especially where injuries may be severe. Given
such information, product users, particularly those less familiar with
a product, are more likely to exercise greater caution during use. Fu
rther, manufacturers' concern that explicit warnings may negatively im
pact sales appears to be unwarranted.