Jeffrey Joerres and Dominique Turcq in strategy+business on Rethinking the Value of Talent:
"Two significant barriers stand in the way of a more productive or strategic approach to recruiting, developing, and deploying employees.
First, many managers are reluctant to categorize people, for fear of appearing elitist.
Second, human resources departments typically classify individuals according to the functions or the business units — the vertical silos — in which they work, not how essential their roles are, or what experience or other personal qualities are required to perform the role. No attempt is made to classify people horizontally across functions or business units, according to how “business-critical” they are."