As the NFL enters the spread era, matchups have become more important than ever and teams employ a variety of strategies to get favorable matchups that can lead to big plays and points. The most basic strategies involve different personnel groupings and formations, mixing and matching players and moving them around. For example, motioning a running back lined up in the backfield into the slot and matching him up against a linebacker. After a quarterback and five offensive linemen that leaves five spots for skill players. In the current decade the most common personnel grouping is 11, or one running back and one tight end, which leaves three receivers.