Greatness is defined in so many different ways. Statistical production, individual awards, team success, longevity, supporting cast, level of competition, raw talent and athletic ability all factor heavily in determining overall greatness. Sometimes, you simply know greatness when you see it.

So all factors were considered when trying to determine who the greatest running backs of the BCS era have been. Here are the Top 50 ball carriers since the BCS was implemented in 1998:

The Pac-12 is loaded with potential standout running backs for 2013.

After 11 seasons under Jeff Tedford, California decided it was time for a change. Tedford was fired after the season finale, and former Arizona offensive coordinator and Louisiana Tech head man Sonny Dykes was hired as the team’s new coach.

The Golden Bears have plenty of talent in the program but slipped to a disappointing 3-9 mark last year. If the pieces come together, California could challenge for a bowl game in 2013.

With spring practice underway for most college football teams, the countdown to the 2013 season has officially started. With preseason predictions right around the corner, it’s never too early to start thinking about which players might be the next breakout stars. 

Greatness is defined in so many different ways. Statistical production, individual awards, team success, longevity, supporting cast, raw talent and athletic ability all factor heavily in determining overall greatness. Sometimes, you simply know greatness when you see it.

So all factors were considered when trying to determine who the greatest quarterbacks of the BCS era have been. Here are the Top 50 signal callers since the BCS was implemented in 1998:

* - active, ** - not all seasons played in BCS era

With spring practice underway for many college football teams, the countdown to the 2013 season has officially started. With preseason predictions right around the corner, it’s never too early to start thinking about which players might be the next breakout stars.

Each year a unique set of prospects enters the professional ranks with a chance to make an immediate impact on the country's most powerful sport. The 2013 NFL Draft, held April 25-27, won’t be any different. Guards and centers generally don't go very high in the draft as good ones can be found in the mid-to-late rounds. Two guards were taken a year ago in the first round — No. 24 and No. 27 overall — and no centers. The 2013 interior linemen class features one of the best guards scouts have seen in years and it means more than two inside blockers could go in the first round.

Each year a unique set of wide receiver prospects enters the professional ranks with a chance to make an immediate impact on the country's most powerful sport. The 2013 NFL Draft, held April 25-27, won’t be any different. This group will feature freaks of nature who need to polish their game. It has lightning quick jitter-bugs who will dominate the open field from the slot position. And it has elite, big-framed, down-the-field vertical threats as well. Whatever offense your favorite team runs, there is a wide receiver in this draft for you.

After a disappointing 3-9 record last season, California made a coaching change, firing Jeff Tedford in favor of Sonny Dykes. Although Tedford did a lot of good things in Berkeley, the program had two losing seasons over the last three years and failed to build off its 28-9 stretch from 2004-06.

With spring practice getting ready to start for all 125 college football teams, quarterback battles will now take center stage. For most national title contenders – Alabama, Oregon, Ohio State, Stanford, Georgia, Notre Dame and Clemson – quarterback isn’t a question mark. However, there are a handful of teams that could be a conference title contender that enter spring practice with uncertainty under center.