Accuracy is one of 8 primary statistics. Increasing accuracy by one point increases the character's ranged damage bonus by .2, increases the chance to cause hemorraging by .3 percent, and reduces accuracy malus (penalty) by .14.
Upgrading certain implants also increases accuracy. Cyber eyes increases accuracy by 1.3 per level to a maximum bonus of 13, and Cyber weapon interface increases accuracy by 1.4 per level to a maximum bonus of 14.
Accuracy can be increased by shooting at enemies with ranged weapons.