On average across all schools, the impact of having a principal 1 standard deviation more effective than the average principal is as much as seven additional months of
learning in a single academic year.
In the training area we also have other projects such as INAV, which is the first online secondary education center for adults, with an integrated training program which allows to take the second cycle of secondary
education in a single academic year and it is designed for the adult population.
In terms of student learning, research also shows that student with the most effective teachers on average advance a grade and a half on academic
assessments in a single academic year, while students of similar backgrounds with the least effective teachers acquire about only half a grade level of learning in the same academic year.
Research has shown that «the difference in student
performance in a single academic year from having a good as opposed to a bad teacher can be more than one full year of standardized achievement.»
The learning gains made at Bridge PSL public
schools in a single academic year are equivalent to almost 3 years of English instruction and nearly 2 years of math instruction at traditional public schools.
The 1,669 institutions in the Educational Policy Institute's study «collectively lost revenue due to attrition in an amount close to $ 16.5 billion
in a single academic year,» according to The «Forgotten Students» report.
After implementing Empowering Writers methodology, some schools have improved writing and reading assessment as much as 25 %
in a single academic year.