Michael, I just wrote blog on this re productivity benefits and costs of implementing (http://intel.ly/T1n4x4). Intel IT enabled BYOD starting in 2010 and we have generated an estimated 7 million hours of extra productivity as a result at Intel.
Another resource you might find handy is this Consumerization Planning Guide from the Intel IT Center - lays out 5 steps for embracing. (https://www-ssl.intel.com/content/www/us/en/mobile-computing/consumerization-of-it-planning-guide.html)
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