They're looking at game tape, attending pro days, hosting the top prospects for private workouts.
They'll study arm strength, command of the huddle and 40-yard dash times.
What about brain power?
ESPN's Chris Mortensen reported the Wonderlic intelligence scores from many of the notable quarterbacks who took the test lat month at the NFL scouting combine.
Greg McElroy, Alabama: 43.
Blaine Gabbert, Missouri: 42.
Christian Ponder, Florida State: 35.
Ricky Stanzi, Iowa: 30.
Andy Dalton. Texas Christian: 29.
Ryan Mallett, Arkansas: 26.
Cam Newton, Auburn: 21.
Jake Locker, Washington: 20.
Some teams weigh Wonderlic scores more than others.
The generally accepted score that keeps teams comfortable is 20. Anything lower creates concern.
But it's not a definitive measurement either. Among widely reported scores, Hall of Famers Jim Kelly and Terry Bradshaw posted 15s, Donovan McNabb scored a 14 and Ryan Leaf posted a 27. Dan Marino's score is reported as a 16 or a 15, depending on the source.
"It is interesting that you will find guys that are really, really bright that just don't test well and just the opposite," New England Patriots personnel executive Floyd Reese said in a USA Today story a few years ago, while working for the Tennessee Titans. "A guy will score a 40 and can't get across the street."