The union saw this as proof that the district could afford raises for teachers and that some unpopular budget cuts, such as increases in class size, were unnecessary. (educationnext.org)
Thus variation in class size may be simply the result, rather than the cause, of differences in student achievement. (educationnext.org)
That it is not may reflect the fact that the experiment was designed to evaluate the effects of differences in class size, not the career - ladder program. (educationnext.org)