The difference between UCD and user interface design
User-centred design and user interface design are often conflated — and the confusion is costly. UI design is the output: the screens, the components, the visual layer. User-centred design is the process that determines what those screens should do, for whom, and why. Without UCD, UI design is decoration applied to the wrong solution.
Arallium practises user-centred design in the original and rigorous sense: every design decision is grounded in evidence from research with real users. We do not design from assumptions. We do not skip the research phase because a client feels they already understand their users. And we do not sign off a prototype until it has been tested with the people who will actually use the service.
This is the GDS standard. It is why GOV.UK has a 74% average citizen adoption rate for services that have passed GDS assessment — compared to 23% for Caribbean digital services built without this discipline.
Average citizen adoption for UK services that passed GDS assessment
Average citizen adoption for comparable Caribbean digital services built without GDS methodology
The difference is not technology. It is not budget. It is whether user-centred design was embedded from the start — or applied at the end as decoration.
Discovery → Alpha → Beta → Live
Four phases, each with a specific purpose and specific outputs. We follow this lifecycle on every engagement — adapting the pace and scale to the programme, but never skipping the phases.
Understand before designing
User research with the people who use and operate the service. Service blueprints mapping end-to-end journeys. Ecosystem maps. Stakeholder analysis. This phase answers one question: what problem are we actually solving?
- User interviews and contextual research
- Service blueprints
- Ecosystem and stakeholder maps
- Problem statement and design principles
Test ideas early
Prototype the most promising solutions — quickly and cheaply — and test them with real users. The goal is to learn fast and fail early, before any significant development investment is made.
- HTML/CSS prototypes (GOV.UK Prototype Kit)
- Usability testing with real users
- Iterative design based on research findings
- Accessibility testing from day one
Build the right thing
The service is built based on the evidence from Alpha. We work alongside developers to ensure design intent is preserved through build — and continue to test and iterate as the service takes shape.
- Embedded design in the delivery team
- Ongoing usability testing
- WCAG 2.2 AA accessibility compliance
- GDS assessment preparation
Improve continuously
Launch is not the end. We monitor usage, analyse completion rates and dropout points, and feed findings back into ongoing iteration. A live service that is not improving is declining.
- Analytics and usage monitoring
- Ongoing user research
- Continuous iteration based on evidence
- Capability transfer to in-house teams
How we adapt GDS methodology for the Caribbean
The GDS framework is universal. But applying it in the Caribbean requires adaptations that only a consultancy with genuine regional knowledge can make.
Design for the most excluded user first
In the Caribbean, the most constrained user is often on a low-end Android device, with intermittent connectivity, low data allowances, and limited digital confidence. We design for this user first. When the hardest case works, every other case works too.
Services that work across geographies
Archipelago nations like the Bahamas require services designed for users who cannot travel to a ministry office. Offline-first thinking, SMS fallbacks, and low-bandwidth design are built into our approach for dispersed island populations.
Working within Caribbean government structures
We understand how Caribbean governments commission and procure. We know how to present UCD recommendations in ways that work within ministerial approval processes, how to navigate multi-agency coordination, and how to build the internal relationships that make digital transformation sustainable.
Flexible delivery models
We adapt our engagement model to the needs of the programme — from embedded long-term delivery to targeted specialist input at critical points.
Lead UCD Consultancy
Directly contracted by a government ministry or agency. We take full responsibility for user-centred design across the programme — from Discovery through to Live — working alongside the ministry's delivery team and any technology suppliers.
Typical client
Education ministries, revenue authorities, health departments commissioning digital transformation programmes.
Sub-consultant / Associate Partner
Embedded within a prime consultancy's delivery team — typically a Big 4 firm, systems integrator, or digital agency. We provide the specialist UCD expertise that the prime contractor does not have in-house, while they lead the overall engagement.
Typical client
Consultancies bidding on or delivering Caribbean government digital contracts who need specialist UCD sub-contractor credentials.
Specialist Advisor
Targeted expert input at critical junctures in a programme — a Discovery phase review, a GDS assessment preparation, an accessibility audit, or a usability testing programme at a specific point in development.
Typical client
Governments or consultancies with in-house teams who need external specialist challenge or validation at key decision points.
Capability Builder
Training and coaching programmes to develop in-house UCD capability within a government ministry or agency — including workshops, embedded coaching, and structured knowledge transfer over a defined period.
Typical client
Governments investing in long-term internal UCD capability who want to complement external expertise with sustainable internal skills.
Let's talk about your programme.
Book a free 30-minute consultation to discuss your programme and how user-centred design can make a difference.