Four Phases of a Fight-- ACID
In Wing Chun there are four distinct phases in a fight: avoid, close, immobilize/stick, and disable (ACID) and pretty much in that order, though close and stick might not be necessary in all confrontations. A description of each is provided below:
1. Avoid: Wing Chun practitioners avoid violent confrontation whenever possible (this is yet another reason you will rarely see competent Wing Chun in a competitive match). However, if forced into an altercation, the next three phases become applicable.
2. Close: Wing Chun techniques are very compact and efficient. In most cases Wing Chun will go after the first available target which will probably be an opponent’s limb. Consider all of Chum Kiu’s simultaneous movement and limb disabling and/or control techniques. – this may not be necessary if an opponent has already closed the distance and started an attack.
3. Immobilize/Stick: Once an opponent’s limb has been acquired a Wing Chun practitioner NEVER lets it go unless necessary to gain a better advantage. Even when striking an acquired limb is controlled by the forearm or elbow for the duration of the altercation. -- This may not be necessary if an opponent’s vital point is already exposed/unprotected. A Wing Chun practitioner will usually sink into an appropriate stance once contact is made or is imminent.
4. Disable: A competent Wing Chun practitioner will unleash 6+ techniques or attacks per second all directed at opening and/or striking vital points on an adversary. A Wing Chun practitioner’s goal is avoiding conflict; however, when a conflict becomes unavoidable, they end it as quickly as possible with the least amount of force necessary.
 See “The Council”
 Most of these are considered illegal or low blows in competitive sport fighting
Components of Martial Competency
Martial Competency is the sum of your ability to apply wing chun or other martial skills during training/practice or real-world situations. It is collectively composed of six major elements; beginning with awareness and followed by any of the other elements in no order. Every mind works differently, and each element may manifest differently or unexpectedly from students/practitioners as innate capabilities allow. Each of these elements will also be refined and/or expanded upon with dedicated training, practice, and experience.
For example: A black sash would expectedly have a higher level of awareness concerning wing chun techniques; or even a basic technique; than a white sash.