re: Where has the Voucher System been effective exactly?

Agree 100% on the home environment being the most important. If you listen to the stories of Dr. Ben Carson, Thomas Sowell, and others, they all trace their success basically back to the importance their parents placed on education. However, the reason I think private education can win out in a voucher system and prove to be much more valuable than government subsidized schools is because it will provide incentive to improve vs more funding for failure. The only problem I have now is I can't find many examples of its implementation.