Whether this theory is producing results is unclear at this point as we do not yet have a large amount of rigorous evidence on the effects of reducing high - school size. (educationnext.org)
Finally, readers should remember that a lack of rigorous evidence does not necessarily mean that a model is ineffective or of low quality. (csrq.org)
Or could they use the resources they already have in a new way, such as by focusing on classroom instructional strategies supported by rigorous evidence? (aypf.org)