How Usability is measured in Jurnii UX

Overview

Usability is a critical component of the Jurnii UX scoring framework. It ensures that user journeys are not only functional but also intuitive, efficient, and frictionless.

We measure usability by applying the Nielsen Norman Group’s 10 Usability Heuristics across key user journeys. These heuristics are globally recognised principles used to evaluate the quality of user experiences in digital products.

Within Jurnii:

• Usability contributes 30% of the overall Jurnii Score

• Each journey is assessed against all 10 heuristics

• Scores are aggregated to produce a Usability Score per journey

How the Framework Works

1. Journey Mapping

We begin by identifying and mapping core user journeys, such as:

• Registration

• Signing In

• Depositing

• Finding Bets / Games

• Getting Help

• Using Promotions

Each journey is broken down into key steps and interactions.

2. Heuristic Evaluation

Each journey is evaluated against the 10 usability heuristics, including:

• System status & Feedback

• Match between system and the real world

• User control and freedom

• Consistency and clarity

• Error prevention

• Recognition ease

• Flexibility and efficiency of use

• Aesthetic and design

• Simplicity & IA

• Help and documentation (This is covered in our Journey analysis as we audit the Help journey available to users)

Each heuristic is applied contextually to the journey, rather than in isolation.

3. Scoring Methodology

• Each heuristic is scored based on observed UX quality

• Scores reflect:

  • Presence of usability best practices

  • Severity of friction or gaps

• Scores are aggregated into a total usability score per journey

• This contributes 30% weighting to the overall Journey score

Example: Error Prevention (Heuristic #5)

Definition:

Improve the experience when errors occur by providing clear, contextual messaging and effective recovery routes that help users understand what went wrong and how to resolve it.

How We Evaluate Error Prevention in a Journey

Using Registration as an example, we assess:

Form Validation

• Are fields validated in real time?

• Are errors identified at the field level?

Error Messaging

• Are error messages:

  • Clear and specific?

  • Actionable?

  • Positioned near the relevant field?

Recovery Guidance

• Are users given clear instructions to fix the issue?

• Are examples provided (e.g., password requirements, format hints)?

Prevention Mechanisms

• Are input masks used (e.g., phone number, date of birth)?

• Are constraints applied before submission?

Confirmation & Safeguards

• Are users prompted before committing irreversible actions?

What Good Looks Like

• Inline validation prevents submission errors

• Clear, human-readable error messages

• Visual cues (icons, color states) guide correction

• Input formats are guided (e.g., date pickers, masks)

• Users can recover quickly without restarting the flow

Impact on UX & Conversion

Strong error prevention:

• Reduces user frustration

• Minimises drop-offs during critical flows

• Improves completion rates (e.g., registration, payments)

• Builds trust through clarity and predictability

Weak error prevention:

• Increases friction and cognitive load

• Leads to repeated failed attempts

• Negatively impacts conversion and retention

Why This Matters

By embedding usability heuristics into journey evaluation:

• We move beyond subjective UX opinions

• We create a consistent, scalable evaluation framework

• We identify high-impact friction points across journeys

• We directly connect UX quality to business outcomes (conversion, retention)

Key Takeaway

Usability in Jurnii UX is not a standalone metric—it is a structured, heuristic-driven evaluation applied across real user journeys.

By systematically applying the Nielsen Norman heuristics, we ensure every journey is:

• Easy to use

• Error-resistant

• Efficient

• Conversion-optimised