This study investigates the structures of variables influencing on teacher changes for
school innovation. For this investigation, structural equation modeling is employed using
survey data from teachers of Gyeonggi-province who participated in in-service training
program for school innovation. The study further elaborates the framework by adding a
variable of teaching efficacy to a model of teacher professional growth in which changes in
teachers' beliefs and attitudes occur when teachers confirmed changes in student learning
outcomes as a result of practices and staff development. First, the research finding suggests
that motivation to participate is important to explain the degree of teacher satisfaction with
professional development not to mention other variables. Second, teachers' professional
experimentation in the classroom and confirmation on the intended outcomes significantly
influence teacher changes. Third, teacher efficacy has direct influence on teachers' attitudes
and beliefs and at the same time mediates such two variables as perception on students'
learning outcomes and dependent variable (beliefs and attitudes). Therefore the research
provides suggestions that focusing on practices in teachers' in-service training is more
effective that larger-group lectures. And programs with strategies for increasing teacher
efficacy need to be valued to make the professional development better.