Explain the circular economy and the difference between linear and circular models, and apply circular thinking to material choices in design

What this dot point is asking

This dot point asks you to explain the circular economy, contrast it with the linear model, and apply circular thinking to material choices. The circular economy is a way of organising production and consumption so that materials are kept in use for as long as possible, rather than thrown away. You should understand the difference between the linear "take, make, dispose" model and the circular "keep in use" model, the idea of designing out waste, and practical design strategies such as durability, repair, recyclable materials and design for disassembly. This builds on sustainable design and asks how designers can help close the loop on materials.

The answer

The linear economy: take, make, dispose

The traditional model is linear: we take raw materials, make them into products, use the products, and then dispose of them as waste. This model treats resources as endless and waste as inevitable. It is unsustainable, because finite resources run down and waste piles up in landfill or pollutes the environment. Most products today still follow this take-make-dispose path, which is the problem the circular economy sets out to solve.

The circular economy: keep materials in use

A circular economy aims to keep materials and products in use for as long as possible and to design out waste, so that at the end of one use materials flow back into new products rather than being discarded. Instead of a straight line ending in the bin, materials move in loops: reused, repaired, remanufactured, or recycled back into the system. The goal is to imitate natural cycles, where nothing is truly waste because everything becomes the input for something else.

Designing out waste

A central principle is that waste and pollution should be designed out from the start, because most of a product's environmental fate is decided at the design stage. This means avoiding unnecessary materials, avoiding mixing materials that cannot be separated, avoiding toxic substances, and planning from the beginning for what happens to the product and its materials at end of life. Waste is treated as a design flaw to be prevented, not an unavoidable by-product.

Design strategies for circularity

Designers support a circular economy through specific strategies:

• Durability. Design products to last, so they stay in use longer.
• Repairability. Design so products can be fixed (replaceable parts, available spares) rather than thrown away when one part fails.
• Design for disassembly. Design so a product can be taken apart easily at end of life, using screws or clips rather than glue, and keeping materials separate, so parts can be reused, remanufactured or recycled.
• Recyclable and renewable materials. Choose materials that can be recycled or that come from renewable sources, so they can re-enter the cycle.
• Reuse and remanufacture. Design products and parts to be used again or rebuilt into new products.

Circular thinking in material choices

Choosing materials with circularity in mind means thinking beyond the first use: can this material be recycled, is it renewable, can it be separated from other materials, and what will happen to it at end of life? A single material that is easily recyclable is often more circular than a clever combination that cannot be separated. Circular material choices keep resources in use and out of landfill, which is the practical contribution designers make to a circular economy.

Examples in context

Example 1. A modular product. A product built in modules that can be individually replaced or upgraded, rather than discarded whole, keeps materials in use and reduces waste. When a part fails or becomes outdated, only that module is changed, illustrating durability, repair and design for disassembly working together in a circular approach.

Example 2. Closed-loop packaging. A scheme where packaging is returned, cleaned and reused many times, rather than thrown away after one use, keeps the material circulating. It contrasts sharply with single-use linear packaging and shows the circular principle of keeping materials in use applied to everyday packaging.

Try this

• Cue. Take a product you own and decide whether it follows a linear or circular model. Identify one feature (glued shut, mixed materials, or replaceable parts) that pushes it toward "dispose" or toward "keep in use".

• Cue. Explain "design for disassembly" in your own words, then suggest how one everyday product could be redesigned to come apart more easily so its materials can be recovered.

• Cue. Choose a single-use product and redesign it for a circular economy using at least three strategies (durability, repair, disassembly, recyclable materials, reuse). Explain how each keeps materials in use rather than sending them to landfill.