What makes a product well-designed: utility, ergonomics, manufacturing and life cycle
A product is well-designed when it fulfils a function that is relevant to the people and the context for which it was designed, can be used effectively and safely, can be manufactured consistently, and takes into account what will happen during its maintenance, repair and end of life. Its appearance matters, but it cannot compensate for problems relating to usability, ergonomics, production or durability.
Adjectives do not prove that a product works
In a shop catalogue or a launch campaign, a reusable bottle is usually described using a predictable sequence of adjectives: elegant, ergonomic, innovative, sustainable and of superior quality. These are appealing terms, but they convey very little information about how the object is actually designed. They do not explain how it feels in the hands that hold it, how it fits into the rucksacks in which it is carried, or the industrial processes that made it possible.
There is another way to describe exactly the same object. You can analyse a bottle by asking whether it can be opened with one hand whilst walking; whether its mouth allows it to be filled under a standard domestic tap without splashing; whether the outer surface provides a good grip when wet or cold; whether it can be transported without leaking under changes in pressure; whether it allows you to drink from it without having to tilt your neck excessively; whether its interior and thread can be cleaned thoroughly without residue accumulating in inaccessible corners; whether its tolerances allow hundreds of thousands of units to be manufactured without any play; whether it is possible to replace a worn silicone seal without discarding the entire cap; and whether its materials can be easily separated at the end of its useful life.
The first description consists of sales adjectives. The second describes actual actions.
This difference marks the gap between viewing an object as a finished image and understanding it as a design solution. Adjectives express intentions; verbs force us to verify them. Judging a product — be it an office chair, a cordless drill, wireless headphones or a coffee maker — requires shifting one’s focus from how it looks to what it actually enables the user to do, under what conditions, and at what cost to the user, the manufacturer and the environment in which it will exist.
Before we talk about ergonomics: what is it actually for?
The starting point for any object is not its appearance or its technological complexity, but its utility: the ability to solve a specific problem, satisfy an operational need or facilitate a human activity effectively.
Usefulness is often confused with an abundance of functions. A tool does not become more useful simply by accumulating additional features. A bottle opener that incorporates a torch, a compass and wireless connectivity is no better designed than a compact piece of steel that allows you to remove a bottle cap with a clean, smooth motion, does not slip in your hand, takes up minimal space in a drawer and lasts for decades without rusting. The accumulation of secondary functions often masks a poor definition of the primary function and tends to compromise the product’s size, weight, cost and reliability.
This is where the concept of functional design comes into play. Far from being interpreted as a sacrifice of aesthetics or an austere style where everything is reduced to mechanical minimalism, functional design seeks to ensure that the geometry, choice of materials, layout of controls and internal mechanisms respond precisely to the object’s fundamental purpose and its actual context of use. Aesthetics and function do not compete with one another: proportions, textures and visual balance are all part of the way in which an object communicates its utility and guides its use.
Determining the utility of a design requires answering rigorous questions:
- What is the critical task that this product must perform without fail?
- In what physical context is it used: in low light, whilst wearing gloves, in a hurry, whilst on the move?
- How often is it used: several times a day or only occasionally?
- What are the operational consequences if the product fails whilst in use?
When these questions remain unanswered, any subsequent effort to embellish the casing or refine the finishes is built on a hollow foundation.
The body is also part of the specifications
Once the task has been defined, the product must meet the needs of the user. This is where ergonomics comes into play.
The International Ergonomics Association (IEA) defines human factors and ergonomics as the scientific discipline focused on understanding the interactions between human beings and the other elements of a system, applying theory, principles, data and methods to optimise human well-being and the overall performance of the system. Reducing this discipline to the idea of ‘comfort’ is a common mistake. Comfort is, at best, a symptom or a secondary consequence; the core of ergonomics lies in the physical, biomechanical and perceptual fit between the object and the capabilities of the human body.
For an object to be ergonomically well-designed, the design team must analyse objective parameters:
- The forces and pressures the user must exert to operate a mechanism.
- The joint positions required during prolonged use.
- The visual and manual reach required.
- The repetitiveness of movements and the associated muscle fatigue.
- Vibration absorption, thermal insulation and protection against entrapment or cuts.
This is where anthropometry comes to the fore: the quantitative study of the dimensions and proportions of the human body. Bodies vary significantly in height, limb length, hand size, grip strength and joint mobility. Designing with a hypothetical ‘average user’ in mind is a methodological error: an object sized exclusively for the statistical average often proves uncomfortable or inaccessible to a considerable proportion of the actual population.
True ergonomic principles assess ranges of variation and incorporate adjustment margins or versatile geometries that allow for safe and efficient use by people with diverse physical characteristics.
Usable does not automatically mean ergonomic
In contemporary product development, the boundary between usability and physical ergonomics is often blurred, even though they address complementary dimensions.
The ISO 9241 standard defines usability in terms of effectiveness (whether the user manages to complete the intended task), efficiency (the amount of resources, time and effort invested in doing so) and the satisfaction with which specific individuals achieve their objectives in a given context of use.
A product may be usable in a one-off test whilst, at the same time, being poorly designed from an ergonomic point of view. Consider an orbital sander or a pruning shears: a user may immediately understand how to switch it on, how to change the attachment and how to make the cut with complete effectiveness during a three-minute trial. From the perspective of immediate usability, the product works.
However, if that same tool, after forty minutes of continuous use, forces the user to twist their wrist, transmits excessive vibration to the joint or exerts painful pressure on the base of the thumb, the design fails from an ergonomic point of view. Usability assesses the clarity of interaction and the successful completion of the task; ergonomics ensures the physical well-being, safety and biomechanical sustainability of that interaction over time.
The user experience can also have weight, sound and heat
The concept of user experience (UX) tends to be associated almost exclusively with screens, applications and digital environments. However, the ISO’s own normative definition recognises that experience encompasses the set of perceptions, emotions and responses arising from the use or anticipated use of any system, product or service. Physical objects create a constant, tangible and sensory experience.
In physical product design, the user experience is mediated through specific material properties:
- Mass and centre of gravity: how the balance of a handheld vacuum cleaner feels when the tank is full.
- Acoustic feedback: the crisp, muffled sound confirming that a car door or the lid of a household appliance has closed securely.
- Thermal behaviour: how quickly the handle of a coffee pot dissipates heat, allowing it to be held without getting burnt.
- Mechanical resistance: the smoothness and progressive resistance of a rotary dial that allows you to adjust the intensity without looking directly at the indicator.
- Routine maintenance: the ease with which a hand mixer can be taken apart to be rinsed under running water, leaving no inaccessible areas where bacteria can thrive.
A physical product constantly communicates its state through tactile, auditory and mechanical cues. When a button requires excessive force, a casing creaks under moderate pressure or a surface is slippery due to a lack of texture, the user experience is compromised just as severely as with a confusing digital interface.
Making one and making a thousand are different challenges
It is relatively straightforward to define the shape of an object in a three-dimensional computer model or to build a handmade prototype in a workshop. The real challenge of product design begins when that geometry must be mass-produced, identically and economically viably, thousands or hundreds of thousands of times in succession.
This is where the methodology known as Design for Manufacturing(DfM ) comes into play. Design for Manufacturing involves considering, right from the initial sketches, how the selected materials, proposed geometries, permissible tolerances and assembly stages interact with the specific manufacturing processes that will be used in industry.
The shape of a part cannot be conceived in isolation from how it is produced:
- A plastic part intended for injection moulding requires uniform wall thicknesses to prevent sink marks, draft angles that allow it to be ejected from the mould without deformation, and a carefully considered position of the parting line.
- A metal part designed for CNC machining requires internal radii compatible with the diameter of the cutting tools and geometric accessibility without impossible turns.
- A folded sheet metal chassis must adhere to the material’s minimum bend radii to prevent tensile cracks during folding.
Linked to the manufacturing process is the control of tolerances: the permissible dimensional variation relative to the theoretical nominal dimension. On the screen, two digital components fit together perfectly because they operate in a mathematical environment free from friction or thermal variability. In a real production plant, machines have variation margins, polymers contract as they cool and metals expand. A well-designed product does not demand unnecessary microscopic precision in all its dimensions — which would make production so expensive as to render it unviable — but rather defines intelligent clearances and accommodates variations where they do not compromise function or appearance.
Assembly is another key design decision. How many manual operations are required to build the product? Does it require screws of five different lengths, or does it standardise fasteners? Reducing the number of parts usually lowers costs and speeds up assembly lines, but taken to extremes it can result in heat-sealed casings that prevent subsequent maintenance. Well-executed product engineering balances production efficiency with the ability to dismantle the object when necessary.
The product remains a design even when it is no longer new
For decades, much of industrial development regarded a product’s lifecycle as ending at the point of sale. Once the user had paid for the item, the designer’s responsibility seemed to cease.
In the fields of marketing and business management, the term ‘product life cycle’ usually refers to the commercial phases of a product on the market: introduction, growth, maturity and decline. In contemporary product design and engineering, however, the life cycle describes an entirely different physical and environmental reality: the material journey stretching from the extraction of raw materials and industrial processing, through logistics and distribution, the active phase of use, maintenance and repair, right up to disassembly, reuse or material recovery at the end of its useful life.
This holistic view lies at the heart of eco-design and circular design. A common oversimplification is to equate sustainability with the mere use of recycled materials or cardboard packaging. A product made from recycled plastic that breaks after six months due to poor structural design of its ribs has a far greater environmental impact than a product made from virgin aluminium or solid wood that can function for three decades, be repaired using common tools and be efficiently recycled when it is no longer fit for purpose.
The European Ecodesign Regulation for Sustainable Products (ESPR, Regulation (EU) 2024/1781) establishes a regulatory framework specifically designed to ensure that durability, reliability, upgradeability, reparability and recyclability cease to be merely aesthetic choices and are progressively incorporated into the specifications for multiple categories of goods. The European framework on the right to repair is moving in the same direction; national regulations under this framework were due to come into force in Member States from 31 July 2026 to guarantee access to spare parts and repair tools at reasonable prices.
Designing with the life cycle in mind involves making design choices that take into account the days after the product is first used:
- How does the outer surface age when exposed to sunlight, sweat or everyday scratches?
- Are components subject to natural wear and tear — batteries, seals, switches, cables — accessible and replaceable via reversible mechanical fastenings, or are they fixed in place with structural adhesives?
- Are polymer types clearly identified by standardised recycling codes engraved on the parts to facilitate their final sorting?
Design does not end when the object leaves the box; it is put to the test throughout the years it must continue to function without ending up in a landfill.
Improving one aspect can worsen another
Assessing a product on technical grounds requires abandoning the illusion that there is a perfect solution which maximises all variables at the same time. Design is fundamentally about managing trade-offs and resolving simultaneous tensions between conflicting requirements.
Any formal or structural decision brings advantages in one area and creates constraints in another:
- Waterproofing versus repairability: a continuous seal using ultrasonics or epoxy resins guarantees an IP68 rating for protection against water and dust in a portable speaker or a sports watch. At the same time, this airtight seal virtually eliminates any possibility of opening the device to change the battery without breaking the outer casing.
- Tactile ergonomics versus recyclability: incorporating a soft-touch elastomeric outer coating onto the rigid handle of a brush or tool improves grip and the sense of biomechanical control. However, this multi-material overmoulding process bonds two different polymers almost inseparably, which contaminates mechanical recycling streams at the end of the product’s useful life.
- Structural weight reduction versus material fatigue: reducing the wall thickness in the frame of a city bike or the chassis of a wheelchair reduces material consumption and makes daily transport easier for the user. However, this reduction requires fine-tuning of the structural calculations so as not to compromise fatigue resistance after hundreds of thousands of dynamic load cycles.
Good design is not characterised by the absence of compromises, but by the clarity and rationale with which they are made. A poorly designed product makes compromises due to carelessness, ignorance or tight deadlines; a well-designed product makes conscious trade-offs because it prioritises what is truly critical to its function, its users and its operating environment.
Four words that should never be accepted without a question behind them
The language surrounding industrial products often relies on claims that sound technical but frequently conceal a marked lack of rigour. When faced with such terms, it is always advisable to pose a verifiable question:
1. ‘Ergonomic’
The necessary question: For which specific body dimensions, in which working posture, for how many consecutive minutes and whilst performing which specific task has it been validated? If the person describing the object cannot answer these conditions, the word is merely being used as a marketing claim.
2. ‘Intuitive’
The essential question: What visual or mechanical cues does the object include to enable the user to deduce the correct action without resorting to external instructions? People do not operate on pure intuition, but rather draw on mental models and prior learning. An object is not intuitive by magic: it is intuitive when its affordances clearly communicate how it should be gripped, pushed or adjusted.
3. ‘Manufacturable’
The key question: Under what specific industrial process, with what dimensional tolerances, for what annual production volume and involving how many assembly operations? A part modelled in 3D software is only viable if it can be cast, machined, stamped or printed consistently within the anticipated costs.
4. ‘Sustainable’
The key question: At what exact stage of the life cycle does it reduce its environmental impact, and what specific measures does it incorporate to ensure its durability, maintainability and the separation of materials at the end of its useful life? Sustainability is not a static property achieved by adding a percentage of plant-based fibre to a polymer; it is a measurable balance throughout the product’s entire life.
What does a designer learn when they start asking these questions?
Developing this kind of judgement radically transforms the way one views the material world. Those who begin their training in design are usually driven by the desire to devise attractive forms or conceive unique inventions. However, maturing in this discipline involves discovering that a form cannot stand on its own unless it elegantly resolves its relationship with the body, the constraints of the material and the demands of industry.
At UDIT, the field of Product Design is approached from this holistic perspective: an object does not end with its external silhouette, but rather requires the integration of research into human needs, ergonomic validation, rigorous material selection, optimisation for mass production and strategies covering the entire life cycle. Understanding materiality requires examining how industrial processes behave in practice—a learning process that is consolidated in specialised technological spaces such as Protospace, where digital geometries undergo physical testing through injection moulding, machining, technical printing or cutting.
This perspective also enables a clear understanding of the relationship and the boundary between Product Design and User Experience (UX). This is not a simplistic division between ‘the physical’ and ‘the digital’. Both disciplines share the same foundations: people-centred design, research into human behaviour, and the need to verify whether the interaction between the individual and the artefact is effective, safe and satisfactory.
However, their fields of application and technical tools address different challenges:
- Product Design delves into the physics of materials, postural biomechanics, structural strength, industrial manufacturing processes, physical logistics, assembly and the circularity of materials.
- User Experience (UX) delves into information architecture, interaction design, cognitive flows, navigation systems, interface accessibility and behaviour on digital service and product platforms.
Both perspectives complement one another and engage in continuous dialogue within today’s design ecosystem, but they require specialised methodological and technical skills to address the complexities of their respective media.
A well-designed product needs fewer adjectives and better decisions
Assessing whether an object is well designed is not a matter of personal taste or adherence to fleeting stylistic trends. It requires verifying whether it fulfils its purpose reliably, whether it respects and protects the body of the user, whether it can be manufactured with precision without wasting resources, and whether it has been designed to age with dignity, be repaired when it fails, and break down into clean materials when its function is complete.
When a product strikes that balance, it does not need to rely on grandiose adjectives in its advertising. Its quality is demonstrated in everyday use: in the ease with which it allows one to work, in the absence of play even after years of service, and in the unseen ingenuity with which it was manufactured.
Starting to look at an object in this way changes the question. It is no longer enough to imagine what form it might take: we must understand who will use it, how it will respond to the body, how it can be manufactured, and what will become of it after years of use. Explore UDIT’s Product and UX department and discover the disciplines that shape these decisions.
