11/15/2012 01:20 pm ET Updated Jan 15, 2013

The Backstage 30: Karin Vanasse And 29 Other Actors On The Brink Of Stardom

Konstantin Stanislavsky wrote, "In the language of an actor, to know is synonymous with to feel."

Truth. But in a post-"Moneyball" world, acting is one of the few businesses in which subjectivity still reigns over objectivity. Casting directors, agents, filmmakers--all are regularly engaged in the qualitative analysis of actors' work. Quantitative data enters the picture only in small bits, usually in the form of lies about height, weight, and age. For generations, the gatekeepers to stardom have operated from their guts, and most of them are perfectly happy to keep it that way.