Mountains of research shows that interviewing job candidates doesn’t tell you much about how they’ll perform. Depending on whose research you believe, 45% to 75% of new hires don’t deliver what employers originally wanted. Assessing performance through exercises doesn’t tell you anything better.
This means that tossing a coin has as good a chance of finding you the right person as the more lugubrious process of weeding through résumés and sitting through hours of painful interviews. You could just hire anyone. It would save you time and trouble, and you’d get to learn about the candidate the right way: on the job. [read]