Big data promises to change the world. Sometimes, though, medium data can massively move the needle. Particularly when applied to an area that has historically been managed by gut instincts, like talent management. Bringing ever more data to the human side of business is a natural evolution. Corporations have squeezed nearly every drop of efficiency they can from general ledger, but the line item that comprises the biggest costs has, until recently, not been subjected to the microprocessor’s sharpening stone. Why? The challenges for people-centric investment decisions are three-fold. 1.  Success is Ill-Defined Even the biggest brains in the C-suite whom