The present paper extends the existing literature on assertiveness in
a way that supports industrial training as well as the selection of in
dividuals for team positions. Data are reported from three studies tha
t examined determinants of team performance-related assertiveness. Fir
st, data from 149 college students demonstrated that assertiveness con
sists of multiple dimensions which were not all related to performance
in a team decision-making task. Second, data obtained from 225 busine
ss students indicated that correlations among self-report measures and
peer ratings of the same assertive responses assigned by intact team
members varied according to the interpersonal context (i.e., personal,
stranger, work related) in which scale items were framed. Third, data
from 60 college students suggested that team performance-related asse
rtiveness has a significant skill component. Whereas both attitudinall
y focused and skill-based training improved attitudes toward team memb
er assertiveness, practice and feedback were essential to producing be
havioral effects. Implications for selection and team training are dis
cussed.