Many studies have applied Hall's (1977) Stages of Concern Questionnaire (So
CQ) to measure teachers' concerns about educational innovations, but there
is a lack of empirical information about the reliability, construct validit
y, and simplex structure of SoCQ data. The results of a comparative analysi
s of 4 alternative Stages of Concern models are reported. Analyses of data
from 1,622 teachers indicated that none of the models provided a good fit t
o the real data. Hall's original 35-item, 7-stage SoCQ was refined to form
a 22-item, 5-stage SoCQ. However, the first stage of concerns had relativel
y little influence on the second stage. Implications for future research ar
e discussed.