Put simply, this means that the best teachers close achievement gaps, while the worst teachers widen them.38 And these results are not just a matter of which teachers receive the less
challenging teaching
assignments: A major, multiyear study from the Bill & Melinda Gates Foundation showed that high - performing teachers remained so
across schools, regardless of whether those schools were high - or low - poverty.39
For some
assignments, struggling students (including some with IEPs) are grouped
across classes to receive extra help from a special education teacher; advanced students who need more
challenge are also grouped
across classes for enrichment projects.