2, engaged in administrative director, engineering supervision, quality inspection also need qualification certificates. Some special industries, such as food industry, need QS ("quality and safety") food production license, as well as special equipment and audio-visual products. The state has special requirements, and the qualification certificate here is particularly important. For individuals, the qualification certificate is also very important. For example, doctors, medical consultants, accountants, lawyers, psychological coaches, business negotiators, international investment consultants and so on all need special qualification certificates.