Short answer

When designing for populations with cognitive impairments like TBI, prioritize simplicity, clarity, and reliability in interface design and navigation over innovative or complex features.

Field: User-Centred Design
Source: Journal of Medical Internet Research (2026)
Method: Mixed Methods, Community-Based Participatory Research (CBPR)
Sample: 33 (Community Advisory Board), 10 (Community Engagement Studios), 14 (empathy interviews), 10 (personas), 5 (usability testing participants with TBI)
Evidence: Strong effect

Directly involving individuals with traumatic brain injury (TBI) in the design process reveals critical usability needs that are often missed in traditional research. This user-centred design research insight is drawn from a 2026 study published in Journal of Medical Internet Research. Using Mixed methods, community-based participatory research (cbpr) with 33 (Community Advisory Board), 10 (Community Engagement Studios), 14 (empathy interviews), 10 (personas), 5 (usability testing participants with TBI), researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing for populations with cognitive impairments like TBI, prioritize simplicity, clarity, and reliability in interface design and navigation over innovative or complex features.

Study

User-Centred DesignNew This WeekStrong effect

Co-designing mHealth interventions with TBI survivors yields specific usability requirements.

Directly involving individuals with traumatic brain injury (TBI) in the design process reveals critical usability needs that are often missed in traditional research.

Journal of Medical Internet Research · 2026

Key Findings

01Co-design successfully translated community feedback into an empathy-informed, user-centered prototype.
02TBI-specific design requirements emerged, including a preference for linear content progression over branching navigation.
03Higher technical performance standards and explicit content signaling were identified as crucial.
04Clarity in interface design was prioritized over novelty.
05Participants struggled with mobile navigation and branching structures but excelled in other areas.

Application

Design takeaway

When designing for populations with cognitive impairments like TBI, prioritize simplicity, clarity, and reliability in interface design and navigation over innovative or complex features.

How to apply

Before finalizing a design for a specific user group, especially those with known cognitive or physical challenges, conduct extensive user research and co-design sessions to validate design choices and identify potential usability barriers.

Project actions

01Involve your target users early and often in the design process.
02Use methods like interviews and usability testing to gather feedback.
03Document how user feedback directly influences your design decisions.

Method & Evidence

AimTo apply community-based participatory research (CBPR) principles to guide the front-end design and evaluate the sociotechnical-pedagogical usability of an electronic problem-solving training (ePST) mobile health intervention with TBI partners.

MethodMixed Methods, Community-Based Participatory Research (CBPR)

ProcedureA multistep, mixed-methods design case methodology was employed. This involved a Community Advisory Board and Community Engagement Studios with TBI survivors, caregivers, clinicians, and researchers. Activities included empathy interviews, persona development, rapid prototyping, and usability testing using think-aloud protocols and a usability assessment instrument.

Sample33 (Community Advisory Board), 10 (Community Engagement Studios), 14 (empathy interviews), 10 (personas), 5 (usability testing participants with TBI)

ContextDevelopment of a mobile health intervention for individuals with Traumatic Brain Injury (TBI).

Variables

IVParticipatory design approach (CBPR vs. traditional research), Interface design elements (linear vs. branching navigation, clarity vs. novelty).

DVUsability of the mHealth intervention, User satisfaction, Effectiveness of problem-solving training.

CVType of mHealth intervention (ePST), Target user group (individuals with TBI), Research phases (Discover, Define, Develop, Deliver).

Strengths & Limitations

Strengths

+Employed a robust CBPR framework, ensuring user voices were central.
+Utilized a mixed-methods approach for comprehensive data collection.
+Iterative design process allowed for refinement based on feedback.

Limitations

The number of participants in the usability testing was small, which might limit the generalizability of the specific usability issues identified. The context of TBI is also very specific.

Reliability & validity

The use of multiple data collection methods (interviews, usability testing, assessment instruments) and the involvement of a diverse advisory board contribute to the study's validity. Reliability is supported by the systematic application of CBPR principles and iterative testing.

Think critically

How might the specific cognitive challenges associated with TBI influence the design of user interfaces, and what are the ethical considerations when involving vulnerable populations in the design process?

Design Principles

"User-centricity in design necessitates deep engagement with the target audience to uncover specific needs and preferences that inform functional and aesthetic choices."

This approach ensures that digital health tools are not only technically functional but also genuinely accessible and effective for the target user group. By prioritizing user feedback from the outset, designers can avoid costly redesigns and create more impactful solutions.

What This Means for Your Design

When you design something for people who have had a brain injury, it's really important to ask them what they need. They told the researchers that they prefer apps that go step-by-step, are easy to use, and clearly show what to do, rather than fancy or complicated ones.

How to use in your project

1.Reference this study when justifying your user research methods, particularly if you are using co-design or participatory design approaches.
2.Use the findings to support your design decisions, especially if your target audience has specific accessibility needs.

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Quick Cite

Paragraph starter

This research underscores the critical importance of user-centered design, particularly when developing interventions for specific populations such as individuals with traumatic brain injury (TBI). The study's application of community-based participatory research (CBPR) principles, involving TBI survivors directly in the design process, led to the identification of crucial usability requirements. Key findings indicated a strong preference for linear content progression, high technical performance standards, and explicit content signaling, prioritizing clarity over novel interface design. These insights are invaluable for guiding the development of accessible and effective digital health tools, ensuring that design decisions are grounded in the lived experiences and practical needs of the end-users.

Source

Journal of Medical Internet Research

Designing Electronic Problem-Solving Training for Individuals With Traumatic Brain Injury: Mixed Methods, Community-Based, Participatory Research Case Study

journal · 2026

View source

Questions About This Research

What does the research say about co-designing mhealth interventions with tbi survivors yields specific usability requirements?: When designing for populations with cognitive impairments like TBI, prioritize simplicity, clarity, and reliability in interface design and navigation over innovative or complex features. Evidence: Journal of Medical Internet Research (2026).
Why does "Co-designing mHealth interventions with TBI survivors yields specific usability requirements." matter for design?: This approach ensures that digital health tools are not only technically functional but also genuinely accessible and effective for the target user group. By prioritizing user feedback from the outset, designers can avoid costly redesigns and create more impactful solutions.
How can designers apply this research?: When designing for populations with cognitive impairments like TBI, prioritize simplicity, clarity, and reliability in interface design and navigation over innovative or complex features.
What were the main findings?: Co-design successfully translated community feedback into an empathy-informed, user-centered prototype.. TBI-specific design requirements emerged, including a preference for linear content progression over branching navigation.. Higher technical performance standards and explicit content signaling were identified as crucial.. Clarity in interface design was prioritized over novelty.
What research method was used?: Mixed Methods, Community-Based Participatory Research (CBPR) with 33 (Community Advisory Board), 10 (Community Engagement Studios), 14 (empathy interviews), 10 (personas), 5 (usability testing participants with TBI).
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2026 journal from Journal of Medical Internet Research.
What should I do differently in my next project?: Before finalizing a design for a specific user group, especially those with known cognitive or physical challenges, conduct extensive user research and co-design sessions to validate design choices and identify potential usability barriers.
What are the limitations?: The findings are specific to the context of TBI and mHealth interventions for problem-solving training; generalizability to other user groups or intervention types may vary.