Through research, I observed that users bring their own assumptions and values to sustainability, which informed the decision to include resources to teach the user about sustainability and demonstrate what is meant by sustainability in the context of this app.
One of the key challenges I encountered was realizing that “sustainability” means very different things to different people. For example, while many assume glass is always more sustainable than plastic, the reality is more complex: without factoring in whether or not something is reused, plastic bottles are more energy efficient to produce than glass. Meaning if you're going to throw out your glass bottle, it's not more sustainable. If you keep it and use it 200 times than it is.
Another challenge was in designing the rewards system. My early wireframes included ideas such as planting a tree for every thousand points, or offering gift cards. However, I quickly ran into questions of feasibility and trust. Rewards have to come from somewhere, but if they came directly from the companies being evaluated, it could compromise the app’s credibility. In the feedback section some of the interviewees mentioned they be slow to trust this app, assuming that it was a greenwashing tool.
In the end, I left the rewards concept open-ended, but this process pushed me to think deeply about business models, incentives, and stakeholder trust, not just user experience. If this were to be developed, I would explore rewards in the form of sponsored coupons or discounts provided by sustainable companies, while keeping the evaluation process completely independent.