A hyeong is a systematic, prearranged sequence of martial techniques that is performed either with or without the use of a weapon. In traditional dojangs (training halls), hyeong are used primarily as a form of interval training that is useful in developing mushin, proper kinetics and mental and physical fortitude. Hyeong may resemble combat, but are artistically non-combative and woven together so as to be an effective conditioning tool. One's aptitude for a particular hyeong may be evaluated in competition. In such competitions, hyeong are evaluated by a panel of judges who base the score on many factors including energy, precision, speed, and control. In western competitions, there are two general classes of hyeong: creative and standard. Creative hyeong are created by the performer and are generally more acrobatic in nature and do not necessarily reflect the kinetic principles intrinsic in any martial system.