Each year I talk to a number of NBA general managers and scouts to create my NBA draft Top 100 and Big Board. But this year I decided to go one step further: to ask those same GMs and scouts to actually rate the top 50 NBA prospects.

Below is our first "Secret NBA Draft Big Board" -- the results of the ratings and rankings from our most informed sources in the league.

We asked them to predict each player's NBA career, according to two questions: How good a prospect is he? What kind of career will he have?

About half of the NBA's 30 teams participated, rating prospects on a 0-to-10 scale. A rating of 0 meant that the player "won't make the league or will have a very minimal NBA career," while a score of 10 meant he was a "top-of-the-line, elite prospect." Our respondents were asked to rate each prospect against all such NBA prospects in recent years.