Eco-efficiency is defined as the delivery of cost-effective products and services that meet human needs and improve quality of life, while progressively reducing ecological impacts and resource use throughout their life cycle, aligning with the earth's carrying capacity. It emphasizes efficient use of materials and energy to achieve profitability and value addition.

The idea of eco-efficiency was first put forward by the World Business Council for Sustainable Development (WBCSD) in the early 1990s [Cite reference]. It centers on producing more goods and services while using fewer resources, as well as minimizing waste and environmental harm. A widely cited definition from the WBCSD describes eco-efficiency as the provision of competitively priced goods and services that meet human needs and enhance quality of life, while continuously lowering environmental impacts and resource use across the entire life cycle to levels consistent with the Earth’s carrying capacity. The WBCSD also identified seven key elements of eco-efficiency:

• Reducing material intensity of goods and services,
• Reducing energy intensity of goods and services,
• Reducing the dispersion of any toxic materials,
• Enhancing the recyclability of materials,
• Making the maximum possible utilization of renewable resources,
• Enhancing the durability (shelf time) of products,
• Improving service intensity of goods and services.

First of all, eco-efficiency is about designing products that reduce environmental impact while still meeting people’s needs. In this project, the cocoon is designed to help reduce children’s anxiety in waiting rooms through calming scents, visuals, and sounds, while also being accessible (including wheelchair access) and hygienic

Because this is a healthcare-related environment, sustainability is not only about the environment but also about well-being and safety. Research [1] shows that the design of spaces, including sound, light, and sensory elements, can have a strong impact on stress and anxiety levels, especially in children.

First of all, Sustainability is the development that satisfies current needs without limiting the capacity of future generations to meet theirs. It has become a central priority in today’s world, which aims to significantly cut carbon emissions while advancing and innovating the technologies of the future. Sustainability and sustainable development aim to strike a balance between competing priorities—advancing technologically and economically while preserving the environments we and others depend on. It involves considering how we can coexist with the natural world, safeguarding it from harm and degradation. However, sustainability goes beyond environmental concerns; it also encompasses the well-being and health of society as a whole. In 2005, the World Summit on Social Development identified three core areas that contribute to the philosophy and social science of sustainable development [Citereference]. The Three Pillars of Sustainability are: - Economic Development - Social Development - Environmental Protection

From an environmental point of view, the main focus is on the materials used and their impact. There are several aspects about it:

• Recycling
• Reducing
• Re-using

When it comes to the product, it is essential to limit its harmful impact on the environment. This can be done by cutting down, reusing, and recycling raw materials, considering energy use throughout every stage of the project, and reducing transportation as much as possible.

Regarding our project: The cocoon uses aluminium and brass, which are good choices in terms of sustainability because they are very durable and highly recyclable. Aluminium, especially, can be recycled many times without losing quality, which fits well with circular design principles.

However, materials like acoustic foam can be problematic because they are often made from petroleum-based products and can release harmful emissions (like VOCs). According to studies [2] and [3], more sustainable alternatives include recycled textile-based acoustic panels or PET felt, which can achieve similar acoustic performance with lower environmental impact.

The antimicrobial technical textile is important for hygiene, but it’s also important to make sure it has low chemical emissions and is safe for indoor air quality, especially since children are more sensitive to pollutants.

Another important aspect of the project’s sustainability is the decision to work with Portuguese suppliers. By sourcing materials locally, the environmental impact related to transportation can be reduced, especially in terms of CO₂ emissions from long-distance shipping. Research in sustainable supply chains [4] shows that transport distance is directly linked to carbon emissions, and reducing this distance is an effective way to lower the overall environmental impact of a product.

In addition, transportation is a major contributor to global greenhouse gas emissions, with the transport sector accounting for a significant share of energy-related emissions [5]

By working with local suppliers, the project can therefore reduce transport distances and associated emissions. At the same time, this approach supports the local economy, allows for shorter delivery times, and improves communication and quality control. For this project, materials such as aluminium, technical textiles, and acoustic solutions should, whenever possible, be sourced from suppliers based in Portugal.

The economic aspect of sustainability focuses on creating long-term economic growth, profitability, and stability without harming environmental or social systems. It ensures businesses remain viable while operating ethically, using resources efficiently, and fostering innovation.

This aspect can be an issue because it is often the most challenging, as it is closely tied to political perspectives, influencing views on what is considered economically viable, as well as the potential impact on businesses, employment, and job opportunities.

It is important to offer incentives that motivate companies to go beyond legal requirements and follow sustainable practices. At the same time, individuals should be encouraged to contribute in whatever ways they can, whenever possible.

The social aspect is actually one of the most important parts of this project.

The cocoon is designed to create a safe and calming space for children, helping to reduce anxiety while they wait.

Accessibility is also key. By including wheelchair access, the design becomes more inclusive and usable for a wider range of children, which is an important part of sustainable design.

The use of non-toxic and antimicrobial materials also improves safety, especially for children who may be more vulnerable to infections or poor air quality.

Additionally, reducing noise and stress doesn’t just help patients—it can also improve the experience for parents and healthcare staff, making the whole environment more comfortable.

One crucial task is to assess how each stage of the life cycle contributes to the overall environmental impact. This analysis is typically aimed at prioritizing enhancements in products or processes and comparing various products for internal purposes. Life Cycle Analysis (LCA) is a method for evaluating the environmental impact of a service or product throughout its life cycle, from design to end-of-life management. LCA or life cycle assessment is an essential tool to support sustainable development decision-making, as well as to assess the potential environmental impacts of a product, material, process or activity.

Provide here the conclusions of this chapter and introduce the next chapter.

Based on this sustainability analysis, the team chose <specify here the design, technique(s) material(s), component(s)> for the following <specify here the relevant sustainability-related reasons>.
Consequently, the team decided to design a solution with the following <specify here the features added for sustainability reasons>.