By the end of this topic, you should be able to...
explain the advantages and disadvantages of using low- and high-fidelity prototyping within a design process.
Guiding Question
Why is it necessary for designers to prototype ideas as part of a design process?
Did you know? Instagram's founders sketched their billion-dollar interface on napkins before writing a single line of code—and that decision saved them months of wasted development.
Why an Iterative Process?
The iterative design process isn't linear; it's a strategic oscillation between exploration and validation. Low-fidelity prototypes—sketches, cardboard models, paper interfaces—are deliberately crude because they're designed to fail fast and cheap. They encourage radical experimentation, invite honest criticism ("it's just a sketch, tear it apart"), and allow you to test ten ideas in the time it takes to perfect one. Their disadvantage? They can't validate technical feasibility, material performance, or manufacturing constraints.
That's where high-fidelity prototypes enter: 3D-printed functional parts, coded interfaces, precision-machined components that simulate the final product's look, feel, and performance. These validate engineering decisions and convince stakeholders—but they're expensive, time-consuming, and psychologically difficult to abandon ("we spent $500 on this, we can't scrap it now").
Professional designers don't debate which fidelity is better; they orchestrate both strategically: low-fi for divergent thinking (generating options), high-fi for convergent validation (proving solutions work). Misuse either, and you waste time building the wrong thing beautifully—or never building anything at all.
Case Study
When IDEO redesigned the MRI experience for children, they started with foam-core and cardboard mock-ups to test whether kids would enter a "pirate ship adventure" without sedation. Only after validating the concept with low-fi prototypes did they invest $100,000+ in high-fidelity installations. This sequenced approach reduced risk while preserving creative freedom where it mattered most.
Learning Goals
In this topic, you'll learn to match prototype fidelity to design stage—understanding when rough is right and when polish is necessary—skills that will define the quality and efficiency of your IA development process.
Linking Questions
What ergonomic aspects should be considered when selecting prototyping techniques? (A1.1)
How are concept models used to generate user feedback in a user-centred design (UCD) approach? (B1.1)
Why are different prototyping techniques used as part of the design process? (B2.1)
How does a good understanding of prototyping techniques help designers approach modelling and prototyping of their potential design solutions? (B2.2)
How can prototyping techniques be used to evaluate the appropriateness of material selection? (B3.1)
To what extent can virtual prototypes and simulations model real-world situations involving structural, mechanical and electronic systems? (B3.2, B3.3, B3.4)