 Downloadable File PDF (140 KB)  IV. Important factors to
consider when implementing an evidence-based intervention in
your schools or classrooms.  A. Whether an evidence-based
intervention will have a positive effect in your schools or
classrooms may depend critically on your adhering closely to the
details of its implementation.  The importance of adhering to
the details of an evidence-based intervention when implementing
it in your schools or classrooms is often not fully appreciated.
Details of implementation can sometimes make a major difference
in the intervention's effects, as the following examples
illustrate.  Example. The Tennessee Class-Size Experiment - a
large, multi-site randomized controlled trial involving 12,000
students - showed that a state program that significantly
reduced class size for public school students in grades K-3 had
positive effects on educational outcomes. For example, the
average student in the small classes scored higher on the
Stanford Achievement Test in reading and math