Quality and after-sales service, brand trust, areas that need improvement.

offline questionnaire interview survey is also called street interception questionnaire survey, which is divided into two forms: small survey and large survey. Small-scale questionnaire survey generally has fewer questions and fewer samples, aiming at solving specific market problems. Large-scale questionnaire survey is a survey method that requires high research ability, and is usually implemented by professional research institutions. Mature research companies have professional pre-research, mid-research and back-end teams and professional data sorting and analysis tools. For enterprises, offline questionnaire survey is usually the key node of market promotion, or the offline questionnaire survey method is adopted in order to obtain more extensive consumer cognitive data in the annual brand tracking research. This paper mainly introduces the precautions in the whole process of large-scale offline questionnaire survey: it is the key to the success of market research to define the research purpose accurately and clearly, and 91% of the research conducted in China leads to the decline of research efficiency because of the vague research purpose. There are two main purposes of offline questionnaire survey: the survey of verification results, such as taste test and packaging test. This kind of research is usually aimed at a specific group of people and a specific range to verify the results. The number of questions in questionnaire design is usually not too many, and it is highly operable. The other is to find problems and find directions. Such as research before brand creation, research before brand upgrade, research on brand annual tracking, research on key nodes of market development, etc. This kind of research is usually carried out by professional research companies. After the first draft of the questionnaire is designed, try to visit it. After the first draft of the questionnaire is designed, try to visit it in the company first, and modify it in time when problems are found. The research company intercepted the target consumers in the street for a trial interview. After there was no problem, the questionnaire was finally determined. After the questionnaire is confirmed, before the implementation of centralized training for project team members, the project leader will conduct centralized training for research supervisors and monitoring personnel of the marketing department to standardize the operation of interviewers, so as to ensure a unified understanding of the questionnaire, recording methods and on-site operation. Newcomers grasp the key steps of implementation. If it is the first time for a newcomer to take charge of the monitoring task on site, he must be familiar with the designated street visit manual of the research company and grasp the key steps of implementation.