The statistic Mr. Hoover quotes, "...a 73 percent decrease in referrals after his district implemented a four-day work week." may indicate a correlation but it does not indicate causation. Was there anything else going on in the Chattanooga County School District that may have caused or contributed to the decrease in referrals? An example of one thing that might affect such a change is re-instituting corporal punishment. Another thing, perhaps more likely, is increased parental participation in the educational process.