Sustainability labelling is commonly applied to consumer products. It is usual to find labels related to different sustainability aspects, such as environment, health or fair trade. Consumers with sustainability awareness will base their choices on how the product aligns with their values. However, consumer preferences about sustainability traits may depend on the specific type of product.

To determine whether perceptions on labelling about sustainable aspects differ between types of products, a study was carried out in which 73 participants chose between three versions of a same product, each version containing a sustainable label (environmental, social or related to health). Three different products for daily use were chosen: food (a milk carton), clothing (a t-shirt) and a personal hygiene product (a bottle of shampoo). For each product and aspect of sustainability, the labels were chosen among the best known. Participants had to select around various perceptions: quality, price, sustainability, trust, willingness to pay and general choice (preference).

The results show that, for some questions, the choice of the preferred sustainability aspect depends on the product. Therefore, it is concluded that the evaluation and decision criteria of sustainable labelling may vary, depending on the type of product to which it is applied.

Going green is increasingly important for many companies and consumers. The present research indicates that functional and emotional factors can achieve the best-perceived effects when choosing an environment-friendly product. Therefore, this study aims to gather these attractive factors from high-involvement groups by using Miryoku engineering. First, we capture them through the Evaluation Grid Method and use Quantification Theory Type I for quantitative analysis. Then, generalize four feelings about environment-friendly products, namely “Assured,” “Responsible,” “Safe,” and “Comfortable.” We also define a linear dimension with short-, normal-, and far-sight for locating attractive factors. The result shows that high-involvement groups are more concerned about the long-term impacts of “Responsible” feeling, while low-involvement groups focus more on the obvious benefits of “Responsible” and “Safe” feeling. Moreover, the emphasis on natural ingredients is necessary for achieving “Assured” and “Comfortable” feeling for both the high- and low-involvement groups.

This study focused on bird species in Taiwan, employing a spiral model to investigate the design and usability of an app for Taiwan's endemic bird species through simplified bird images, interactive framework, text icons, and user interface, along with heuristic evaluation and usability testing. The matching test results verified that the focuses of bird image design were on the color contrast of a bird's body part with the rest of the bird's body, overall tone, and the design/shape of a bird's body part. In terms of usability test results, the app system designed had a usability score of 74.773 with the level between "good" and "excellent"; and was rated "excellent" in dependency, stimulation, and novelty under user experience; was rated "good" in attractiveness and efficiency, and was rated "above average" in perspicuity. Furthermore, significant usability and user experience differences were observed between the interface using narrative and text icons in introducing bird information. Accordingly, when the same ecological information interactive framework is applied, the use of graphic rendering to create interfaces based on simplified bird images and text icons helps improve the usability of the system, as well as the attractiveness, perspicuity, efficiency, dependability, stimulation, and novelty of the system in terms of user experience.