34.2 Slip Systems I Definition Slip Systems is the combination of a crystallographic plane and a direction lying on it. On the plane and along the direction slip takes place A slip plane plus a corresponding slip direction is called a slip system§4.2 Slip Systems ◆ Ⅰ. Definition： Slip Systems is the combination of a crystallographic plane and a direction lying on it. On the plane and along the direction slip takes place. A slip plane plus a corresponding slip direction is called a slip system.  