2025 IB DP Design technology Practice Paper with Answers

Sustaining innovation refers to the development of a product that improves its performance based on feedback and expectations of existing mainstream customers. Disruptive innovation targets overlooked segments or creates a new market. Radical innovation involves high risk and completely new technology. Architectural innovation modifies the linkages between existing components.

Award 1 mark for identifying the correct type of innovation. Correct option is A.

A persona is a profile of a primary target user, constructed from real research, used to represent user needs, goals, and behavior patterns.

Award 1 mark for identifying 'Persona' as the correct tool. Correct option is B.

For clearance design (such as door heights or legroom), the 95th percentile of the population is used to ensure that the vast majority (including tall users) are accommodated.

Award 1 mark for the correct option (C). Option A, B, and D do not provide sufficient clearance for the majority of tall individuals.

A mock-up is a scale or full-size representation of a design used for evaluation, particularly for ergonomics, scale, and layout. It is often non-functional and made of low-cost materials.

Award 1 mark for identifying 'Mock-up' (B). A prototype is functional; an aesthetic model focuses only on appearance; an instrument model is used for quantitative testing.

Cradle-to-cradle (C2C) is a biomimetic approach to the design of products and systems that models human industry on nature's processes, where materials are viewed as healthy nutrients circulating in healthy, safe metabolisms (technical and biological cycles).

Award 1 mark for 'Cradle-to-cradle' (B). Cradle-to-grave represents linear lifespan ending in disposal.

By optimization of patterns (nesting), the manufacturer reduces the amount of raw material used and waste generated in the first place, which is a 'Reduce' strategy (dematerialization/reduction at source).

Award 1 mark for 'Reduce' (D). This is reduction of waste at the source. Other options are post-generation strategies.

Laggards are the last consumer segment to adopt an innovation. They are usually highly traditional, suspicious of change, and risk-averse.

Award 1 mark for identifying 'Laggards' (B). Late majority adopts after the average user, while early adopters and early majority adopt much sooner.

Rotational molding (rotomolding) is ideal for producing large, hollow, one-piece plastic items such as kayaks and large tanks, because the process involves a rotating mold that coats the interior surfaces evenly with plastic powder or liquid under heat without requiring high injection pressures.

Award 1 mark for 'Rotational molding' (C). Injection molding is not suitable for hollow closed parts of this scale. Blow molding is typically used for smaller hollow items like bottles.

A persona is a profile of a primary target user, created from detailed research of the target user population, used to help designers understand user needs, goals, and behaviors throughout the design process.

Award 1 mark for the correct option B. Reject all other options.

Dematerialization is the reduction of total material and energy throughput of any product and service, or replacing physical products with digital alternatives (like streaming music instead of buying CDs).

Award 1 mark for the correct option A. Reject all other options.

Compatibility is how well the innovation fits with the values, past experiences, and needs of potential adopters. By matching the traditional physical and installation interface, it is highly compatible with existing home infrastructure and user expectations.

Award 1 mark for the correct option C. Reject all other options.

Mass customization is a marketing and manufacturing technique that combines the flexibility and personalization of custom-made products with the low unit costs associated with mass production.

Award 1 mark for the correct option A. Reject all other options.

For clearances (such as doorway heights, public transport entryways, or safety barriers), designers must accommodate the largest users (the 95th percentile or higher) to ensure that almost all users can pass through safely without hitting their heads.

Award 1 mark for the correct option C. Reject all other options.

Classic designs often play a major role in the cultural history of their time, achieving cultural dominance and becoming recognized symbols of a particular era, country, or cultural movement.

Award 1 mark for the correct option C. Reject all other options.

Hardness is the ability of a material to resist scratching, wear, tear, and localized surface indentation.

Award 1 mark for the correct option B. Reject all other options.

Reuse refers to using an object or material again, either for its original purpose or for a different purpose, without changing its physical form through energy-intensive recycling processes.

Award 1 mark for the correct option B. Reject all other options.

A persona is a detailed profile of a hypothetical primary target user, compiled from user research. It helps designers empathize with user needs, goals, behaviors, and frustrations.

[1 mark] B is correct because a persona is a representative user profile used to guide design decisions.

Dematerialization refers to the reduction of the total material volume and/or weight of a product or its packaging while preserving its core utility. Redesigning packaging to reduce its overall weight and volume directly aligns with this strategy.

[1 mark] C is correct. A focuses on detoxification, B on energy efficiency, and D on recycling.

A registered design is used specifically to protect the aesthetic and visual appearance of a product (such as its shape, pattern, or ornamentation), provided it does not serve a purely functional purpose.

[1 mark] B is correct because registered designs protect the non-functional visual appearance of objects.

Stereolithography (SLA) is an additive manufacturing process that uses a computer-controlled ultraviolet laser to trace a cross-section of the 3D object onto a vat of liquid photopolymer resin, curing and solidifying it layer-by-layer.

[1 mark] D is correct. SLS uses powder (B), LOM uses sheet material (C), and FDM uses thermoplastic filament (A).

Radical innovation involves introducing a completely new technology or paradigm that replaces previous systems and significantly disrupts existing markets. The leap from mechanical springs and gears to digital quartz oscillation represents this shift.

[1 mark] B is correct. Sustaining and incremental innovations build on existing tech, whereas quartz was a brand-new fundamental technology.

Embodied energy is the total cumulative energy required to extract raw materials, process them, manufacture a product, and transport it to its point of purchase.

[1 mark] B is correct. Option A refers to recycling energy, D refers to operating energy, and C is kinetic energy.

To ensure clearance for almost the entire population (avoiding head injuries), designers must accommodate the tallest segment of the population, which corresponds to the 95th percentile.

[1 mark] C is correct. Designing for clearance requires accommodating the 95th percentile, whereas designing for reach requires accommodating the 5th percentile.

Timelessness is a key trait of classic designs, where their appeal remains constant over decades and transcends changing trends and technological shifts.

[1 mark] B is correct. Timelessness represents enduring relevance and appeal over generational shifts.

Sustaining innovation involves small, incremental improvements to existing products to maintain market position and competitiveness without changing the fundamental architecture. An incremental 10% improvement of an existing battery technology is a classic sustaining innovation.

Award 1 mark for the correct option C. Incorrect options: A is radical (complete departure from existing technology), B is disruptive (creates a new market and value network), D is architectural (reconfigures existing technologies in a new way).

A persona is a fictional character profile created to represent a specific user group or target segment, helping designers understand user needs, experiences, behaviors, and goals.

Award 1 mark for the correct option B. Incorrect options: A refers to the entire group of potential users, C is a list of steps defining interactions between a user and a system, D is a narrative of a user performing a task in a specific context.

For clearance designs (such as doorways, corridors, or safety spaces), the designer must accommodate the tallest users to prevent injury. Therefore, the 95th percentile (the upper limit of the target population) is used as the baseline.

Award 1 mark for the correct option C. Incorrect options: A and D use the 5th percentile which is for reach/access, B uses the 50th percentile which would exclude 50% of the population.

Computational Fluid Dynamics (CFD) is a computer-based mathematical model that simulates how gases or liquids flow around an object. It relies on mathematical algorithms to predict physical performance.

Award 1 mark for the correct option B. Incorrect options: A and D represent physical objects, C is a non-functional physical model used for basic visual feedback.

Dematerialization refers to the reduction of the total material and energy throughput of any product and service. By replacing heavy plastic bottles with concentrated, low-weight pods and simple cardboard, the quantity of material used is greatly reduced.

Award 1 mark for the correct option A. Incorrect options: B refers to fixing broken products, C is transforming waste into higher-value products, D is partitioning a system into smaller parts.

Embodied energy is the sum of all energy required to produce any goods or services, considered as if that energy was incorporated or 'embodied' in the product itself during its journey from extraction to retail.

Award 1 mark for the correct option B. Incorrect options: A, C, and D describe only specific phases or physical properties rather than the total energy of production and supply chain.

Technology push occurs when scientific research or technological advancements drive the development of a new product, which is then pushed onto the market, even before consumers are aware of its potential utility.

Award 1 mark for the correct option B. Incorrect options: A is market pull (driven by customer demand), C is corporate social responsibility (ethical practices), D is process innovation (manufacturing methods).

Ubiquity means the product is omnipresent, constantly visible, and found almost everywhere in daily life, which is a key characteristic of classic designs.

Award 1 mark for the correct option B. Incorrect options: A refers to becoming outdated, C is styling inspired by the past, D is a standard design that has become accepted by the market.

Designing for adjustability typically aims to accommodate the 5th percentile female (lower limit) to the 95th percentile male (upper limit). This range ensures that approximately 90% of the entire mixed-gender target population can adjust the seat height to a comfortable and ergonomically correct position.

Award [1] for the correct answer. Reject other options as they either exclude a significant portion of the user base or represent incorrect anthropometric ranges.

A scenario is an imagined story or context of use detailing how a persona behaves in a real-world situation to accomplish a task. Option A defines a persona, Option B defines a use case, and Option D defines a technical specification.

Award [1] for identifying option C as the correct description of a scenario.

A Cradle-to-Gate assessment is a partial product life cycle assessment from resource extraction (cradle) to the factory gate (before transport to the consumer). This excludes the distribution, use, and disposal phases.

Award [1] for identifying Cradle-to-Gate as resource extraction to the factory gate.

Innovators are the first group to adopt an innovation. They are willing to take risks, have the highest social status and financial liquidity, and maintain close contact with scientific sources and other innovators.

Award [1] for the correct classification of 'Innovators'.

JIT relies on receiving goods only as they are needed in the production process, reducing inventory costs. However, any supply chain disruption (such as transit delays or component defects) can instantly halt the entire assembly line due to the lack of buffer stock.

Award [1] for identifying supply chain disruption halting production as the primary risk of JIT.

Sustaining innovation involves improving the performance of established products along dimensions that mainstream customers in major markets have historically valued. Incremental updates to battery and camera specs fit this definition.

Award [1] for classifying the incremental product improvement as a sustaining innovation.

Dematerialization refers to the absolute or relative reduction in the quantity of materials required to fulfill a specific utility. Shifting from physical compact discs (CDs) to a purely digital streaming service represents absolute dematerialization, as the physical packaging, plastic, and transport footprint are eliminated.

Award [1] for selecting the shift to digital streaming as dematerialization.

A classic design is characterized by timelessness, instant recognition, and enduring appeal, which often allows it to transcend its original functional purpose and retain its value and status over generations.

Award [1] for identifying instant recognition, enduring appeal, and transcending original function as the criteria for classic design status.

Think-aloud protocols allow researchers to gain direct insight into the user's cognitive processes by asking them to speak their thoughts during tasks. For elderly users, this reveals barriers such as confusing menu hierarchies or unclear feedback in real-time. By observing where the user's verbalized expectations differ from the actual appliance interface, designers can locate exact pain points and redesign the product to align with the users' mental models.

Award [1] for explaining how verbalizing thoughts provides direct, real-time insight into the user's confusion or frustration during product interaction.
Award [1] for linking this feedback to identifying specific cognitive barriers, such as a mismatch between the user's mental model and the system interface.

Under a product-service system (PSS), the manufacturer retains ownership of the seating and leases it to clients. This establishes a continuous, long-term relationship with customers that yields predictable, recurring service and leasing revenue rather than a one-time transaction. Furthermore, because the manufacturer retains physical ownership, they can easily retrieve the seats at the end of their lifecycle, allowing them to reuse high-value components and materials, which lowers raw material costs.

Award [1] for identifying a benefit related to long-term customer relationships or ongoing, predictable revenue streams.
Award [1] for explaining how retaining product ownership facilitates closed-loop manufacturing, material recovery, or reduced resource costs at end-of-life.

By being the first to market (pioneering), the start-up can capture significant market share and build strong brand loyalty, making it harder for later entrants to attract customers. Additionally, they can file patents for their non-invasive sensor technology early, legally preventing competitors from copying their design and securing technological leadership.

Award [1] for explaining how being first to market secures brand loyalty, top-of-mind awareness, or early market share.
Award [1] for explaining how early entry allows the company to secure patents/IP rights, creating barriers to entry for competitors.

In a CIM system, the digital design (CAD) is directly linked to the manufacturing machines (CAM). If a design change is needed (e.g., custom tube lengths), the software automatically updates the machine paths and G-code. This reduces the setup times and costly tool changes typical of manual setups, allowing the production line to rapidly adapt to custom frame designs or variable batch sizes on demand.

Award [1] for explaining how CAD/CAM integration automates the translation of digital design changes into manufacturing instructions without manual intervention.
Award [1] for linking this automation to reduced setup times, minimal downtime, or the ability to cost-effectively produce custom/variable frame batches.

The 'elastic user' fallacy occurs when designers stretch or redefine the target user's capabilities (e.g., assuming they are tech-savvy when convenient, then assuming they need simplified text later) to suit their current design decisions. Distinct personae lock in specific user traits, goals, and technological literacies, serving as an objective reference point that keeps the design targeted on realistic user profiles throughout development.

Award [1] for explaining how personae define concrete, non-negotiable user characteristics and limitations.
Award [1] for explaining how this prevents designers from altering user assumptions ('stretching' characteristics) to justify their own design choices or convenience.

Dematerialization involves using less material in the packaging design without compromising its protective function. This directly reduces the overall weight and volume of the packaged smartphones. During the distribution phase, lighter and smaller packages mean that transport vehicles can be loaded more densely and require less energy/fuel to move, significantly lowering carbon emissions and transport resources.

Award [1] for identifying that dematerialization reduces the physical volume and weight of the packaging.
Award [1] for explaining how this reduction allows more efficient shipping density (more products per load) or reduces energy/fuel consumption during transportation.

1. It utilizes a biological by-product (sugarcane bagasse) that is renewable and would otherwise be discarded or incinerated, thereby preventing waste and reducing reliance on finite fossil-fuel resources used for traditional EPS. 2. By using waste from another industry, it exemplifies industrial symbiosis and keeps materials flowing through productive loops. 3. Because sugarcane bagasse is naturally biodegradable, the discarded packaging can be composted, returning organic nutrients back to the biological cycle/soil. 4. This avoids the long-term accumulation of synthetic, non-biodegradable waste in landfills or natural ecosystems, helping to close the loop on material lifecycles.

Award 1 mark for explaining how using an agricultural by-product minimizes waste and resource extraction. Award 1 mark for explaining how it replaces finite/non-renewable materials (such as petroleum-based EPS). Award 1 mark for explaining that the biodegradable nature of the material allows it to return nutrients to the biological cycle/soil. Award 1 mark for explaining how this prevents long-term landfill accumulation or environmental pollution, closing the loop.

1. Designers must conduct initial user research (such as interviews or observations) with individuals suffering from arthritis to deeply understand their physical limitations, grasp strength, and pain points when operating kitchen appliances. 2. The interface and controls should be designed specifically for their physical capabilities, utilizing large levers, push buttons, or magnetic couplings instead of small, high-torque rotary dials that require fine motor control. 3. The design team should build physical, interactive prototypes (such as foam or 3D-printed models) to simulate the product's operation. 4. These prototypes must undergo iterative user testing with the target group, allowing designers to gather direct feedback on ergonomics and force requirements, and refine the design prior to mass production.

Award 1 mark for explaining the role of user research to understand the specific physical limitations and needs of the target user group. Award 1 mark for explaining how a specific design solution or interface feature (e.g., large buttons or levers) directly addresses limited dexterity. Award 1 mark for explaining the use of physical prototypes to test ergonomics and usability. Award 1 mark for explaining how iterative testing and user feedback are used to refine and validate the design before production.

Sugarcane bagasse is derived from agricultural waste which is a rapidly renewable resource. This replaces petroleum-based plastics, thereby reducing the consumption of finite fossil fuels and lowering greenhouse gas emissions over its lifecycle.

Award 1 mark for identifying an environmental benefit of sugarcane bagasse (e.g., renewable resource, biodegradable, or utilizing a waste byproduct). Award 1 mark for outlining how this benefit reduces environmental impact compared to petroleum-based plastics (e.g., lowers carbon emissions or avoids long-term accumulation of plastic waste in landfills).

The NFC tag can link directly to digital interfaces providing audio readouts or simplified visual guides. This directly compensates for common age-related limitations, such as visual decline or cognitive challenges in remembering dosage regimes.

Award 1 mark for identifying an interactive capability of NFC relevant to elderly user needs (e.g., text-to-speech, automated smartphone reminders, or simplified digital instructions). Award 1 mark for outlining how this enhances accessibility or usability for this demographic.

At the end of its life, the sugarcane bagasse packaging can be composted to return biological nutrients back to the biosphere. These nutrients enrich the soil to support the growth of new sugarcane crops, successfully closing the biological loop.

Award 1 mark for identifying that the biodegradable waste is composted or returned as nutrients to the soil. Award 1 mark for outlining how this supports the growth of new crops, thereby closing the cycle and eliminating waste.

To support the 'biological cycle' of a circular economy, mycelium-based packaging functions as follows:

1. **Use of biological nutrients**: Mycelium is an organic, non-toxic material grown using agricultural waste (such as hemp or husks) and fungal spores, making it a pure biological nutrient rather than a synthetic technical nutrient.
2. **Low-impact production**: The growing process requires minimal energy and no toxic chemicals, keeping the biological material free from synthetic contaminants that could hinder future decomposition.
3. **Biodegradability**: After its useful life as protective packaging, the mycelium can be composted. It breaks down naturally through biological action in a short timeframe (typically within weeks).
4. **Nutrient regeneration**: As it decomposes, it returns vital organic matter and nutrients to the soil, actively regenerating natural ecosystems and supporting new plant growth.
5. **Zero-waste loop closure**: By substituting synthetic materials like EPS (which persist in landfills for centuries) with compostable mycelium, the packaging eliminates waste entirely, keeping materials flowing continuously within a safe, natural cycle.

Award [1] mark for each of the following points explained, up to [5] marks maximum:
- **Biological Nutrient Concept**: Explaining that mycelium is an organic, non-toxic material (grown from agricultural waste and fungi) that serves as a biological nutrient.
- **Sustainable Input/Growing Phase**: Explaining that the production relies on organic waste and minimal energy, preventing synthetic contamination.
- **Biodegradation**: Explaining that the packaging decomposes naturally and safely via microbial action post-use (home or industrial composting).
- **Soil Regeneration**: Explaining that the decomposition process returns essential nutrients to the biosphere, enhancing soil quality and supporting ecological renewal.
- **Elimination of Waste/Loop Closure**: Explaining how this avoids landfill accumulation, incineration, or marine pollution, successfully closing the loop of the biological cycle (unlike traditional plastics/EPS).

### Part 1: Circular Economy & Closed-Loop Integration (3 Marks)
* **Material Cycle:** Flax-fiber and PLA are bio-based, renewable resources. At the end of the packaging's life cycle (when it can no longer be safely reused), it can be diverted to industrial composting (biological cycle), returning nutrients to the soil rather than decomposing in a landfill.
* **Technical Tracking (RFID):** The integrated passive RFID tag acts as a digital passport. It allows EcoWrap to track individual containers through distribution, use, and return phases. This data ensures high inventory visibility, allowing the company to identify bottlenecks in the return loop, prompt users who have held onto containers, and quantify the exact number of reuse cycles achieved.
* **Synthesis:** Together, the biological safety of the material and the digital oversight of the technical tracking ensure that materials are kept at their highest utility and value at all times, preventing downcycling and leakages into the environment.

### Part 2: Environmental Life Cycle Trade-Offs (3 Marks)
* **Embodied Energy and Production:** Manufacturing a durable flax-PLA container with an embedded silicon-based RFID chip requires significantly more energy, water, and resources upfront than stamping out a simple, thin single-use aluminum foil container.
* **Reverse Logistics:** A reusable system introduces new environmental burdens, specifically the greenhouse gas emissions associated with transporting dirty containers back to the facility (reverse logistics) and the water, thermal energy, and chemical detergents required to sanitize them to commercial food safety standards.
* **The Reuse Threshold:** For this system to be environmentally preferable to single-use aluminum, it must cross a 'break-even' threshold (e.g., being reused 30–50 times). If containers are lost, damaged, or discarded prematurely, the cumulative environmental impact of the EcoWrap system will actually exceed that of the single-use system.

### Part 3: User-Centered Design & Recovery Rates (3 Marks)
* **Physical Usability (Ergonomics):** The physical design of the packaging must minimize friction for the consumer. It must be lightweight, leak-proof (to prevent messing up users' bags), easy to hand-wash or rinse, and highly stackable to encourage users to store them at home until they can be returned.
* **Behavioral Design Cues:** Clear, intuitive visual cues on the packaging (e.g., 'Return Me' embossing, QR codes for return instructions) remind the user of the product's circular nature, shifting their mental model from 'waste' to 'borrowed asset'.
* **Frictionless Return Infrastructure:** Aligning the return system with user habits (e.g., convenient drop-off bins at transit hubs or collection during the next meal delivery) coupled with app-based incentives (such as loyalty points or a deposit-refund system managed via the RFID scan) directly drives the high return rates necessary to make the entire system sustainable.

### Mark Breakdown (Total: 9 Marks)

#### Section 1: Closed-Loop & Material Selection (Max 3 Marks)
* **1 Mark:** Correctly identifies a circular economy principle or benefit of flax-PLA/RFID (e.g., flax-PLA is renewable/biodegradable OR RFID tracks the container to ensure it is returned).
* **2 Marks:** Explains how the biocomposite (biological cycle) OR the RFID tracking (technical recovery loop) contributes to a closed-loop system.
* **3 Marks:** Fully explains how the biological cycle of the material and the technical capability of RFID tracking work synergistically to maintain a closed loop and manage assets.

#### Section 2: Life Cycle Trade-Offs (Max 3 Marks)
* **1 Mark:** Identifies an environmental trade-off (e.g., biocomposite production has high embodied energy, or washing uses water).
* **2 Marks:** Explains the trade-offs across the life cycle, contrasting the high upfront impacts of durable smart packaging + reverse logistics with low-impact single-use options.
* **3 Marks:** Synthesizes the trade-offs by explaining the concept of a 'break-even' point (the necessity of achieving a high number of reuse cycles to offset the high manufacturing, transportation, and washing impacts).

#### Section 3: UCD and Behavioral Strategies (Max 3 Marks)
* **1 Mark:** Identifies a UCD or behavioral factor (e.g., stackability, return incentives, or ease of cleaning).
* **2 Marks:** Explains how physical packaging ergonomics (e.g., stackability, leak-proofing) or digital touchpoints influence user willingness to return the package.
* **3 Marks:** Fully explains how UCD and behavioral design strategies (like deposit-refund schemes or convenient return infrastructure) minimize user friction to ensure the high return rate required for systemic sustainability.