After two years of dramatic education reform efforts, teachers nationwide are reporting their lowest levels of job satisfaction in 25 years -- 39% -- according to the annual MetLife Survey of the American Teacher. Among the greatest concerns expressed by the teachers who were polled was increased stress, and principals also reported job dissatisfaction, with 75% of principals saying their jobs are too complex. The survey also revealed that most principals and teachers are unsure whether the Common Core State Standards will improve students' performance.