Design Aptitude – Prototyping
NID DAT – Design Aptitude Module
Prototyping is the bridge between ideas and reality. It turns concepts into tangible models that can be tested, refined, and communicated to stakeholders.
1. Simple Explanation
| Term | What It Means | Why It Matters |
|---|---|---|
| Prototype | A preliminary model of a product or system. | Lets designers test functionality, usability, and aesthetics before full production. |
| Low‑Fidelity (Lo‑Fi) | Rough, inexpensive, often non‑functional models (paper, cardboard). | Fast feedback, easy iteration, cost‑effective. |
| High‑Fidelity (Hi‑Fi) | Detailed, often functional models (digital mock‑ups, 3D prints). | Realistic user testing, visual communication to stakeholders. |
| Iterative Process | Building, testing, learning, and refining. | Ensures the final design meets user needs and constraints. |
2. Key Points
| # | Concept | Details |
|---|---|---|
| 1. Purpose of Prototyping | 1️⃣ Validate ideas 2️⃣ Communicate vision 3️⃣ Identify design flaws early | |
| 2. Types of Prototypes | • Paper / Sketch – for UI and layout • Digital Mock‑ups – Photoshop, Figma, Sketch • Physical Models – cardboard, foam, 3D printing • Interactive Simulations – HTML/CSS/JS, Unity, Unreal |
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| 3. Fidelity Spectrum | Low → Medium → High: choose based on stage, goal, and resources | |
| 4. Materials & Tools | • Paper, cardboard, foam board • Adhesives, scissors, rulers • 3‑D Printers, CNC cutters • Software (Adobe Suite, Figma, Blender, Unity) |
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| 5. Prototype Build Steps | 1️⃣ Define objectives 2️⃣ Sketch concepts 3️⃣ Select fidelity & materials 4️⃣ Build prototype 5️⃣ Test & gather feedback 6️⃣ Iterate |
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| 6. Testing Methods | • User Testing – observe interactions • Heuristic Evaluation – expert review • Scenario Walk‑throughs – simulate use cases |
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| 7. Documentation | Keep a prototype log: purpose, observations, changes made | |
| 8. Cost & Time Management | Choose fidelity that balances accuracy with resources | |
| 9. Ethical & Safety Considerations | Use non‑hazardous materials, ensure user safety during testing | |
| 10. Transition to Production | Refine prototype data into final design specifications |
3. Worked Example
Design Brief
Create a reusable water bottle with a built‑in filtration system that fits comfortably in a commuter backpack.
Step‑by‑Step Prototyping
| Phase | Actions | Output |
|---|---|---|
| 1. Define Objectives | - Target users: commuters - Constraints: size ≤ 300 mm, weight ≤ 500 g, filtration capacity ≤ 500 mL - Success criteria: ease of use, durability, clean‑up simplicity |
List of measurable goals |
| 2. Sketch Concepts | Quick hand sketches of bottle shapes, cap mechanisms, filter placement | 3–5 concept sketches |
| 3. Choose Fidelity | Low‑Fi for initial shape & ergonomics; Hi‑Fi for functional filter testing | Decision sheet |
| 4. Build Low‑Fi Prototype | • Cardboard + foam board to mimic bottle shape • Rubber bands for a mock cap • Paper filter strip |
Rough physical model |
| 5. Test Low‑Fi | - Ask 5 commuters to hold & carry - Check grip comfort, ease of opening/closing - Note: “Grip feels loose on back of hand.” |
Feedback notes |
| 6. Iterate Low‑Fi | Adjust shape: add ridges for grip, shorten neck for easier access | Revised cardboard model |
| 7. Build Hi‑Fi Prototype | • 3D print bottle body in PLA • Use silicone for cap • Insert a small activated‑carbon filter cartridge • Add a small bottle of water for real test |
Functional prototype |
| 8. Test Hi‑Fi | - Perform a 30‑min commute simulation - Measure water leakage, filter performance, cleaning time - Note: “Filter clogs after 2 L.” |
Quantitative data |
| 9. Refine & Finalise | Redesign filter housing for better flow; use a larger filter cartridge Update 3D model accordingly |
Final 3D‑printed prototype |
| 10. Document & Prepare Specs | Capture measurements, materials, assembly steps; create a prototype log | Final design brief ready for production |
4. Quick Revision Summary
- Prototyping turns ideas into testable models.
- Fidelity: choose low‑Fi for early feedback, high‑Fi for realistic testing.
- Process: Define → Sketch → Build → Test → Iterate → Document.
- Materials: paper, cardboard, foam, 3D printing, digital tools.
- Testing: user observation, scenario walkthroughs, expert review.
- Outcome: a validated design ready for production, with documented lessons learned.
Tip for DAT: In exams, when presented with a design brief, outline the prototyping steps and justify the choice of fidelity in a concise paragraph. Use the key points above to structure your answer.