Background. This investigation examined factors affecting patient invo
lvement in consultations to decide local treatment for early breast ca
ncer and the effectiveness of two methods of preconsultation education
aimed at increasing patient participation in these discussions. Metho
ds. Sixty patients with Stage I or II breast cancer (1) were pretested
on their knowledge about breast cancer treatment and optimism for the
future, (2) were randomly assigned to one of two methods for preconsu
ltation education: interactive multimedia program or brochure, (3) com
pleted knowledge and optimism measures, (4) consulted with a medical o
ncologist, radiation oncologist, and general surgeon, and (5) complete
d self-report measures assessing their involvement in the consultation
s and control over decision-making. The consultations were audiorecord
ed and analyzed to identify behavioral indicators of patient involveme
nt (question-asking, opinion-giving, and expressing concern) and physi
cian utterances encouraging patient participation. Results. College-ed
ucated patients younger than 65 years of age were more active particip
ants in these consultations than were older, less educated patients. I
n addition, patients showed more involvement when they interacted with
physicians who encouraged and facilitated patient participation, The
method of education did not affect patient involvement although patien
ts tended to learn more about breast cancer treatment after using the
multimedia program than after reading the brochure. Conclusions. Altho
ugh patients vary in their expressiveness, physicians may be able to i
ncrease patient participation in deciding treatment by using patient-c
entered behavior. Also, preconsultation education appears to be an eff
ective clinical strategy for helping patients gain an accurate underst
anding of their treatment options before meeting with physicians.