The current teacher workforce is younger, less experienced, more likely to turnover, and more diverse in preparation experiences than the workforce of two decades ago. Research shows that inexperienced teachers are less effective, but we know little about the effectiveness of teachers with different types of preparation. In this study, we classify North Carolina public school teachers into portals—fixed and mutually exclusive categories that capture teachers’ formal preparation and qualifications upon first entering the profession—and estimate the adjusted average test score gains of students taught by teachers from each portal. Compared with undergraduate-prepared teachers from in-state public universities, (a) out-of-state undergraduate-prepared teachers are less effective in elementary grades and high school, (b) alternative entry teachers are less effective in high school, and (c) Teach For America corps members are more effective in STEM subjects and secondary grades.

Because of the current high proportion of novice high-school teachers, many students' mastery of science and mathematics depends on the effectiveness of early-career teachers. In this study, which used value-added models to analyze high-school teachers' effectiveness in raising test scores on 1.05 million end-of-course exams, we found that the effectiveness of high-school science and mathematics teachers increased substantially with experience but exhibited diminishing rates of return by their fourth year; that teachers of algebra 1, algebra 2, biology, and physical science who continued to teach for at least 5 years were more effective as novice teachers than those who left the profession earlier; and that novice teachers of physics, chemistry, physical science, geometry, and biology exhibited steeper growth in effectiveness than did novice non-science, technology, engineering, and mathematics teachers.

No abstract

State policies affect the qualifications of beginning teachers in numerous ways, including regulating entry requirements, providing incentives for graduate degrees, and subsidizing preparation programs at public universities. In this paper we assess how these policy choices affect student achievement, specifically comparing traditionally prepared with alternative-entry teachers; in-state traditionally prepared with out-of-state traditionally prepared teachers; teachers beginning with undergraduate degrees with those beginning with graduate degrees; and teachers prepared at in-state public universities with those prepared at in-state private universities. Using school fixed effects to analyze data from North Carolina, we find that: Teach For America corps members are more effective than traditionally prepared teachers; other alternative-entry teachers are less effective than traditionally prepared instructors in high school mathematics and science courses; and out-of-state traditionally prepared teachers are less effective than in-state traditionally prepared teachers, especially in elementary subjects where they constitute nearly 40 percent of the workforce.

Research on teacher development reports significant early-career increases in teacher effectiveness, but the extent to which this is attributable to the development of teachers who persist or to the attrition of less effective teachers is unclear. In this study of novice teachers in North Carolina public schools, the authors investigated the development of teachers' effectiveness during their first five years in the classroom and contrasted the effectiveness of teachers who stayed with that of those who left. Across grade levels, teachers' effectiveness increased significantly in their second year of teaching but flattened after three years. The teachers who left the profession were less effective, on average, than those who stayed at least five years, but this finding is somewhat less consistent than the findings of an initial jump in effectiveness and diminishing returns to on-the-job development.