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1966; Jencks, Smith, Acland, & Bane, 1972). Since that time, the empirical
literature has grown exponentially, with it by and large converging on the con-
clusion that teachers do matter. However, conflict remains around how teachers
matter and what type of preparation for teachers is likely to contribute to their
effectiveness. For example, although some research has shown that on average,
preparedness, effectiveness, and retention are higher for new teachers who
have completed preservice programs than for new teachers who received less
preparation prior to entering the classroom (Boyd, Grossman, Lankford, Loeb,
& Wyckoff, 2006, 2008; Clotfelter, Ladd, & Vigdor, 2007; Darling-Hammond,
2006; Darling-Hammond, Holtzman, Gatlin, & Helig, 2005), other studies
have concluded that preservice teacher education programs matter little, if any,
to how effective a teacher is in the classroom (Ballou & Podgursky, 2000;
Kane, Rockoff, & Staiger, 2008; Walsh, 2001).
With significant advances in understanding the importance of teacher
quality, there have been several policy initiatives, such as the Carnegie Task
Force on Teaching as a Profession and the founding of the National Board for
Professional Teaching Standards that have attended to the inputs and pro-
cesses of teacher education (e.g., recruitment, selection, retention; the con-
tent, experiences, and requirements of preservice preparation programs;
accreditation and certification; mentoring new teachers; and continuing pro-
fessional development). There has also been a focus on student outcomes,
specifically, student achievement as a primary indicator of teacher effective-
ness. However, over the past decade the focus on outcomes has intensified, as
evident by calls for and, in some instances, the systems where teachers are
evaluated on the basis of student outcomes.
This focus on holding teachers accountable for outcomes, accompanied
by the plethora of research on teacher education and modern advances in
technology facilitating the ability to gather, store, analyze, and link student
data across P-20 educational settings and beyond, has brought about
increased interest in assessing the effectiveness of teacher education pro-
grams based on outcomes as well. Approaches to outcomes-based account-
ability for teacher preparation programs have fallen into one of four main
categories: (a) evaluation based on the achievement scores of students taught
by program graduates, (b) evaluation based on teacher candidates’ demon-
stration of research-supported teaching behaviors, (c) evaluation of teacher
candidates during their preparation period based on how students perform in
response to their teaching, and (d) evaluation based on how students perform
in response to programs graduates’ teaching during graduates’ early years of
teaching (Cochran-Smith & Powers, 2010). Different forms of accountabil-
ity models for teacher preparation programs now exist in several states,
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