These quick tips are from instructor Roger Gunn of GolfLevels.com.
Ball Flight Description
The ball turns too far to the right by curving away from the target.
Curving Right - Quick TipsGrip: Your hand or hands, especially your left hand, may be turned too far to the left. The "V's" formed between the knuckle and thumb on both hands should point between your right shoulder and right ear.
Set-up: Shoulders and/or feet are often aimed too far to the left.
Ball position: The ball might be too far forward in the stance.
Backswing: Too far to the outside, pushing the club away from you. This often goes along with the club "laying off," or pointing left, at the top. Additionally, there can be a clockwise twisting of the club during the backswing.
Downswing: Right shoulder goes too much out and not enough down. The arms are often pushed away from you at the transition, causing the club to approach the ball from outside the target line. There can also be a "blocking" of the wrists through impact, preventing the club from turning over.
In Depth: Diagnosing and Fixing a Slice