This study examined the impact of online instruction versus traditional instruction on K-12 teachers' attitudes toward technology integration and learning performance. Nineteen teachers participated in either an online graduate course or a traditional course. Questionnaires assessed teachers' concerns before and after the courses. While the online course promoted personal growth, there were no other significant differences in concerns between the groups. Both instruction methods were equally effective in improving teachers' attitudes toward technology integration and learning. Student engagement and responses differed between online discussions and face-to-face conversations.