I recently saw a reference to the difference between Alpha, Beta, and Gamma Readers. Since beginning this venture/hobby I have only really heard of Betas, but it seems people employ the use of Alphas and Betas, too. Does anyone here use all three of these mechanisms for critique, and if so, why? I'd be interested to know what everyone's experiences are with this, or whether you feel that using all three is just an example of overkill. Thanks!