Design Fundamentals
The philosophical reason why a design brief intentionally avoids specifying solutions.
What is to leave the solution space open so the designer isn't constrained before exploring possibilities?
The precise ergonomic term for the study of human body measurements used to size products for a target population.
What is Anthropometrics?
The specific mechanical property that determines whether a material permanently deforms or returns to its original shape after a force is removed.
What is elasticity / elastic limit / yield strength?
The specific CAD advantage that eliminates the need for a physical prototype in early development stages.
What is 3D rendering / digital visualisation allows design review without making anything?
The IKEA Democratic Design principle that directly governs the spatial efficiency of flat-pack furniture, and why it reduces cost beyond just materials.
What is Form; flat-pack form reduces shipping volume, cutting logistics cost per unit drastically across millions of products?
Why a design specification must use measurable criteria rather than subjective language, with an example of each.
What is subjective terms like "strong" can't be tested; measurable criteria like "withstands 50kg load" can be objectively verified?
Why designing for the 5th to 95th percentile of a population is standard practice rather than designing for the average.
What is designing for the average excludes 50% of users; the 5th–95th range captures 90% while avoiding the extreme cost of accommodating every outlier?
Why thermoplastics are used in vacuum forming but thermosetting plastics cannot be, at a molecular level.
What is thermoplastics have polymer chains that soften repeatedly when heated because there are no permanent cross-links; thermosets form irreversible cross-links when cured so reheating degrades rather than softens them?
Why a CAD file is more valuable than a hand-drawn technical drawing when sending work to a manufacturer.
What is CAD files can be directly fed into CNC machines or 3D printers; hand drawings must be reinterpreted manually?
Why IKEA's simultaneous pursuit of low price AND sustainability is considered a genuine design paradox, and how they partially resolve it.
What is sustainable materials and ethical production cost more, conflicting with low price; IKEA partially resolves it through massive scale, long-term supplier contracts, and designing waste out of the manufacturing process rather than sourcing premium eco materials?
The logical flaw in a designer who moves straight from brainstorm to prototype without any evaluation stage.
What is they have no evidence their chosen idea is the best solution; they're just building the first idea, not the optimal one?
The specific failure mode that occurs when a product is functionally perfect and durable but ergonomically ignored.
What is repetitive strain injury / cumulative trauma?
The exact reason injection moulding produces higher dimensional accuracy than vacuum forming for complex parts, and the cost trade-off that makes vacuum forming preferable at low volumes.
What is injection moulding uses a sealed pressurised mould that controls all surfaces simultaneously; vacuum forming only shapes one side, reducing accuracy. But injection mould tooling costs tens of thousands versus hundreds for vacuum forming, making it uneconomical under high volumes?
The term for CAD software that can simulate real-world stress and forces on a design before it is built.
What is FEA / Finite Element Analysis / simulation software?
The specific cognitive bias that makes iterative testing in the GeoPals project necessary even when the designer believes the prototype is finished.
What is the designer's curse / functional fixedness; designers are too familiar with their own product to notice flaws that are immediately obvious to a first-time user?
Why the "Define" stage of design thinking is considered the most intellectually difficult despite coming before any creative work.
What is correctly framing the problem determines everything downstream; a wrong problem statement makes all subsequent work irrelevant no matter how well executed?
Why aesthetic decisions made early in the design process are disproportionately more expensive to change than structural ones made at the same stage.
What is aesthetics drive material, finish, colour, and tooling choices changing them late requires retooling moulds, reformulating finishes, and renegotiating supplier contracts, compounding cost at every layer?
Why a material with high tensile strength can still be a poor choice for an impact-resistant lunchbox, and which property should be prioritised instead.
What is tensile strength measures resistance to pulling forces but impact resistance requires toughness; the ability to absorb energy before fracturing. A high-tensile but brittle material shatters on impact despite its strength rating?
Why changing one dimension in a parametric CAD model automatically updates all related dimensions.
What is parametric modelling links dimensions with mathematical relationships, so all dependent features update proportionally?
Why evaluating three designs against weighted criteria can still produce the wrong final choice, and what additional step eliminates this risk.
What is weighted criteria assume the weights themselves are correct; if the client's stated priorities don't reflect their actual needs, the highest-scoring design still fails. Validating the criteria weights with the client before evaluation eliminates this?
A designer completes a brilliant prototype that users love in testing but the product fails commercially at launch. Identify the design thinking stage that was inadequately executed and the systemic reason why user testing alone couldn't have predicted this.
What is the Define/Empathise stage; user testing validates usability but not market viability, pricing tolerance, or competitive positioning, which require broader stakeholder research beyond end users?
A product satisfies every criterion in the design specification but consistently receives poor user reviews. Using all three factors, function, ergonomics, and aesthetics, construct the most likely diagnosis and explain why specifications alone cannot prevent this outcome.
What is specifications capture measurable minimums but not experiential quality; the product likely meets functional thresholds but fails on ergonomic feel or aesthetic desirability, which are subjective and only revealed through iterative user research that specs cannot substitute for?
A manufacturer switches from stainless steel to a high-grade polymer for a water bottle to cut costs. List three distinct material properties that degrade as a result and explain the specific real-world consequence of each for the end user.
What is thermal resistance (polymer deforms in dishwasher/boiling water), long-term chemical resistance (polymer leaches compounds over time with acidic drinks), and structural rigidity (polymer dents/warps under pressure, compromising the seal)?
A student uses CAD to design a lunchbox but the 3D-printed prototype doesn't match the screen. Name two specific reasons this can happen.
What is incorrect scale/units in the file, and printer tolerance/shrinkage during cooling distorting final dimensions?
IKEA removes one of its five Democratic Design principles and sales remain stable but returns increase 40% within a year. Identify which principle was most likely removed, the causal chain explaining the return spike, and what this reveals about the interdependence of the five principles.
What is Function; without functional requirements, products look good and cost less but fail in use, driving returns. This reveals the principles form a system where removing any single one creates a cascade failure, since low-price aesthetics without function produces attractive but unusable products that destroy brand trust?