The application of data hierarchy is mainly a systematic concept, that is, in order to process the complex information, we must know how to systematically and purposefully categorize the information into categories and statistics.

Scientific management emphasizes the management techniques to make up for the lack of management by experience and visual judgment. In addition to the establishment of correct concepts, this management technique requires the use of data in order to analyze work and take correct measures.

How to establish the original data and the purpose of these data according to the need for the collection of statistics, but also a lot of quality control techniques is the most basic work.

For example: China's aviation market in recent years with the opening up of the increasingly fierce competition, airlines in order to fight for the market in addition to strengthening a variety of measures, but also in the quality of service efforts. We can also often see customer satisfaction surveys on the plane. This survey is conducted through a questionnaire. The design of the survey is usually divided into service quality on the ground and service quality on the airplane. On the ground, it is divided into booking and waiting; on the plane, it is divided into attitude of flight attendants, food and beverage, and hygiene. Through these surveys, the data will be totaled, and we can find out where to strengthen the service quality.