Wing Chun techniques emphasize practicality and efficiency to maintain its ideals on effectiveness. Strikes are intended to injure or disrupt the target. Efficiency in Wing Chun is based on the concept that the shortest distance between two points is a straight line. Likewise its primary targets all lie along the “centerline” of one's opponent.
Wing Chun believes in using the least amount of required force in any fighting situation. It believes properly timed positioning and movements can and should be used to defeat an opponent. This is achieved through balance, body structure and relaxation. The Chinese saying "4 taels to move 1000 catties" (referring to an old Chinese measurement system) is appropriate here in describing how a small amount of force, correctly applied, can deflect a powerful attack.
Wing Chun uses deflection and counter-attacks in the same motion or will intercept the opponent to nullify an attack, rather than blocking then attacking in two separate motions. Further on interception the punch can act as a block as a consequence of the structure and the position of the arm traveling along its triangular "power-line" pathway to the opponent's "Core". This means that the opponent's attack is automatically deflected by the arm-structure of the Wing Chun practitioner as the counter-punch is delivered.