Teaches:
speed draw and fire under stress.

Requires:
three people, or two people and a timer.

Drill:
The Tueller drill is essentially an exercise, under stress, to measure your draw and first shot in terms of distance rather than time. The area that a charging assailant is able to cover in the time it takes you to draw and fire gives you a good idea of what a "safe distance" threshold is.

At the time of the original drill, Gunsite expected a 1.5 second par time for drawing from concealment and firing two shots at a 3-yard target. Tueller found that the average distance an assailant could travel in 1.5 seconds, starting from standing still, was about 21 feet. Any closer, and the assailant might start grappling before the shot can go off.

There have been many arrangements of the Tueller drill. The simplest is to have the "assailant" start back-to-back with the shooter. At the signal, the runner runs and the shooter draws and fires at a 3-yard IPSC target. At the sound of the shot, the runner stops and the distance is measured. If the shot was good (A-zone), the distance counts as the shooter's "score."

A more stressful variation is to have the assailant begin 21 feet away from the shooter, parallel to the firing line. At the signal, the assailant runs toward the shooter and tries to touch her (gently!) on the back as he passes. This is a pass/fail variation.

With ASP Red Guns (plastic guns that are holsterable and drawable), the drill can become a full-contact exercise, with the assailant charging directly at the shooter.

Variations:
A useful variation is to have the shooter sidestep while drawing and firing. Moving to the assailant's 45 degree area throws the charger off balance as he/she attempts to correct and gives the shooter significantly more time to draw and fire. The shooter is also out of the line of attack in the probable event that the shots don't stop instantaneously.