The main objective of this graduation was to design a sustainable hand cart product concept for young families in the Netherlands, which is simple in its design, easy to use, and affordably priced. The hand cart should furthermore be suitable for up to three children to sit in and suitable to transport goods. Research was done on current hand carts on the market, on users' experiences with them, and on the current sustainability and circularity of Greentom's currently produced product. This research resulted in a list of users' needs and wishes in a hand cart, including the ideal dimensions, needed safety norms, needed requirements for it to be easy to use, and the selling price preferred to be under €250. Furthermore, the research concluded that rPP and rPET are the most suitable and sustainable materials to be used in the hand cart chassis and textile respectively, and that an end-of-life scenario where new Greentom products are sent back and refurbished into 2nd-life products would result in hand carts with 62% lower eco-costs and 71%€ value capture compared to the product with a linear incineration end-of-life. By using these concluded required elements of a hand cart, and by defining the Greentom form family and future hand cart style, several ideas were developed after which five product ideas were proposed. The five ideas showed promising iterations on the basic frame structure, folding principle, push/pull bar design, and bottom design. By detailing their ergonomic and constructional aspects, which concluded the exact dimensions, necessary wheel types, push/pull bar positioning, weight-support beam construction, and necessary folding structure iterations, the ideas were concretized into three concepts: 'Horizontals', 'Twofold', and 'Diagonal'. The concepts were evaluated based on three main criteria from the list of requirements, after which the 'Diagonal' was concluded to be the most promising concept to be further developed into detail. Detailing the concept was done by defining the to-be-improved points with a structural mock-up model, and by defining and further developing satisfier and exciter attributes to ensure a high degree of customer satisfaction using the KANO model. Lastly, after building a 1:1 functional prototype of the improved final concept, the prototype was evaluated by means of a user test, and showed to successfully satisfy all users' needs and wishes with positive reactions on all attributes. The final design, the 'Greentom Go' concludes to be 1) simple in its design since it complies with Greentom's form family style while also expressing its own Hand Cart style, 2) easy to use as it is easily (un)foldable, enables children to independently step in and out of the hand cart, allows attachment of Greentom accessories and a baby car seat, and is well manoeuvrable by having large wheels, a pushable handlebar, and by being lightweight (7.57kg), and 3) affordable since the reuse of existing and future moulds as well as the refurbishment end-of-life scenario allows for lower total costs enabling a selling price of €220. Therefore, the stated design goal is concluded to be successfully achieved by the Greentom Go.

Mobile phones are one of the most ubiquitous devices in our lives. The ever-growing demand for mobile phones and rapid upgrade patterns, gives mobile phones an unsustainable linear character, with a big contribution to e-waste. This study is about stimulating consumers to return their mobile phones to extend its life or fulfill another purpose through refurbishment and recycling processes. This project is conducted for the case of KPN’s return program and aims towards a beneficial exchange between KPN and consumer. Beneficial transactions of resources, already take place for millions of years in nature, where designers can learn and derive inspirations from. Therefore, these are explored and used as an inspiration throughout this project. Simultaneously an analysis of the mobile phone ecosystem is done to understand how and why retailers and consumers behave in the current context. An in-depth study with consumers resulted in insights on the impact of factors on current take-back programs. Next, to financial incentives, family friendly practice and charitable/circular motives are identified as incentives during the end-of-use stage. Users need to be informed well on the importance of the return of phones, the ease of the method and their privacy. Also, the perceived value of payback should exceed the perceived financial, functional and sentimental value in old phones and the perception of effort. This requires the elimination of negative factors and enhanced benefits for both KPN and consumer in their cooperation. The insights enabled the generation of relevant elements in nature and a translation onto the case. Based on the insights the design goal is formulated: a satisfactory disposal phase that ensures an alternative and long-term payback method for both KPN and users, that enables the involvement of other users for the spread of circular behaviour. As a result, KPN Bewust is developed: a return system that promotes the spread of information and circular behaviour through its return service. In this system, returning an old phone and involving others, is the by-effect of purchasing the next contract with or without a phone with discounts, which reduces the perceived effort. Persuading friends and family to return their phones, is rewarded with mutual benefits. These generous offers will give KPN a competitive advantage compared to traditional take-back programs, with more longterm and satisfied clients in return. Through the KPN Bewust profile, an overview of the generated discounts, and contacts shows how the advantages of a returned phone can outweigh the advantages of keeping them. This experience will increase the likelihood of repetition and the spread of return behaviour.