**4. Product design methods**

In different design stages and target objects, the complexity of the steps is slightly different and so as the design methods involved. Generally spoken, blows are the common methods involved in the main four steps of product design.

#### **4.1. Design survey**

With the advent of the information age, the world has become smaller and smaller, and the acquisition of various information has become feasible and convenient. The factors that people choose products are increasingly influenced by the individual and the mainstream. At the same time, in the whole product design process, each step has a series of internal or external constraints. The design is just like "dancing with shackles." Every involved part needs information intervention and guidance and gradually coordinates, optimizes, and iterates so as to initiate better ideas and works. This factor makes the investigation and research at the beginning of the design particularly important.

Common survey methods include comprehensive surveys, typical surveys, and sample surveys. The main difference is the coverage of survey samples. When carrying out the survey, firstly, it is necessary to prepare for the whole investigation, determine its objectives, and clarify whether its form is inquiry, observation, experiment, or case, and based on preliminary analysis, formulate the basic ideas and problems of the investigation, and highlight the key points concisely as much as possible.

The second one is to conduct an investigation. This stage is the way to obtain information. Incorporate the survey objectives to determine the respondents, select appropriate survey techniques to determine the query items and design questionnaires, and then conduct a field survey in an orderly manner.

Finally, collate the survey results by analyses and research, draw into various forms, and then present analysis results of the survey, as shown in **Figure 15**.

At different stages of design, surveys are conducted around different surveyees, with different design goals and processes to make sure the final results are armed with comprehensive information feedback, so as to develop and create new products in a targeted manner.
