The Grinnell System is a fast-tempo style of basketball developed by coach Dave Arseneault at Grinnell College in Grinnell, Iowa, USA. It is a variation of the run-and-gun system popularized by coach Paul Westhead at Loyola Marymount University in the early 1980s. The Grinnell System relies on shooting three-point field goals, applying constant pressure with a full-court press, and substituting players frequently.
Arseneault in 1989 inherited a Grinnell program that had not had a winning season in 25 years. After a couple years of trying out traditional eight-player rotations, he felt Grinnell needed to change its basketball philosophy to rejuvenate the team and have more fun. Grinnell was a Division III school that did not offer athletic scholarships, and players that did not receive playing time were quitting. Arseneault developed the Grinnell System, which incorporated a dozen or more players in a game. Through 2012, Grinnell won five conference championships, advanced to the postseason 11 times, and led the nation in scoring at all levels of college basketball in 17 of the past 19 seasons.
Under the system, Grinnell guard Jack Taylor scored an NCAA-record 138 points in a 2012 game, and 109 in a 2013 game. Previously, Grinnell players Jeff Clement (77) and Griffin Lentsch (89) held the Division III scoring record.
The main tenets of the system are:
- The first possible shot is best possible shot, where three-point field goal attempts are preferred over shorter shots.
- Shoot as many three pointers as possible.
- In terms of defense, giving up an uncontested layup is better than a shot clock violation.
- Always double team the person with the ball.
- Every player but the shooter goes for the offensive rebound.
- Offensive rebounds should be sent back for another three-point attempt, not a shorter putback for two points.
Unlike Westhead's system, in which any open player takes a shot, the Grinnell System has a designated shooter on the court. The system employs a constant full-court press on defense. While opponents get easy baskets when they beat the press, the team receives the ball back sooner to attempt a three-pointer. The goal is to get significantly more shots than the opponent by forcing more turnovers and getting more offensive rebounds. When a player misses, Arseneault believed that rebounding the ball and giving the player the same shot within ten seconds usually resulted in a basket. The overall goal of the system is take 100 shots, make half the shots 3-point attempts, force 32 turnovers, rebound one-third of the team's own misses, and outshoot the opponents by 30 attempts.
To keep his players fresh and get more individuals involved, Arseneault added to Westhead's system by substituting players in three waves of five players, similar to an ice hockey shift. A 15-man roster is divided three groups of five and new shifts are substituted every 45 to 90 seconds. Each shift plays at full speed and then rests while the next group does the same. Players rarely play more than 20 minutes a game.
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