For establishing cause-effect relationship on the outcomes targeted in reforms, we are in need
of making experimental studies to collect evidence on effectiveness of the reform-based applications.
Especially, school-based experimental studies might provide important way of establishing causeeffect
relationship regarding to reform outcomes after implementing different methods and techniques
(Cook and Sinha, 2006 p.556). But, lack of experimental models or designs for school-wide
experimental studies is a problematic area for collecting cause-effect evidence and might be a reason
for insufficient number of school-wide experiments (Cook and Sinha, 2006 p.556).