3.2.3. Selective Coding

On the basis of axial coding, selective coding excavates the core category from main categories and analyzes the connection relationship among them. As shown in Figure 1, the dynamic mechanism of public voice behavior to promote policy implementation and evolution in public health emergencies is as follows: First, under the guidance of the government, enterprises participate in the development of policy and design products to assist policy implementation with advanced technologies. Second, in response to the governmen<sup>t</sup> policy, the public will use enterprise products in their daily life and work. And through judging whether the policy can e ffectively solve the current problems and guide the future development of the society to form the policy e ffectiveness perception. Third, public's perception of the e ffectiveness of policies will trigger public emotions. Di fferent perceptions of policy e ffectiveness can lead to positive or negative emotions. Then, emotions can induce public voice behavior, including voice for governmen<sup>t</sup> policies and for enterprise products. Finally, the governmen<sup>t</sup> and enterprises will give feedback to the public voice and improve the policies and products accordingly. As a new external stimulus, the improved policies and products also have an impact on the public's perception of policy effectiveness, forming a dynamic mechanism of public suggestions to promote policy evolution and product innovation, as shown in Figure 1.

**Figure 1.** The model of public voice's formulation and e ffects. Main categories are shaded grey.
