User Acceptance Testing (UAT) is a critical and often mismanaged phase of an HR technology transformation.

It is the point at which the system moves from design and build into the hands of the business. It is where assumptions are tested, processes are validated, and confidence is reinforced… or quietly begins to erode if expectations are not managed well.

Because what’s most important is how the project team responds under the pressure of UAT – how supportive the exec are in the process, how quickly and easily decisions are made, how priorities are set, and whether the discipline established earlier in the project holds when it matters most.

Because the problem isn’t U-AT.
It’s how U-ACT.

So let’s look at the 10 Things I Hate about UAT and how you can address them.

1. When UAT Becomes the “Freak Out” Moment

There is a familiar shift that occurs as UAT begins. Defects start to surface, often quickly and in volume. Questions become more pointed. Stakeholders begin to focus more closely on detail, and the reality of go-live starts to land.

For some teams, this becomes the moment where confidence gives way to concern. Decisions that were previously agreed are revisited, sometimes with a level of scrutiny that wasn’t applied at the time. The tone becomes reactive, finger-pointing, and momentum can often slow as a result. This response is understandable, but it is avoidable if expectations are managed with all team members upfront.

UAT is designed to surface issues! A visible increase in defects at this stage is not a sign that something has gone wrong; it is a sign that testing is functioning as intended. The teams that move through UAT most effectively are those that remain composed when defects appear. They treat the phase as a structured validation checkpoint, not a moment of judgement.

“The mistake organisations make is expecting a smooth ride. The wise ones expect turbulence and prepare themselves accordingly.” – Craig Aunger, CEO Pinpoint HRM

2. When More Testing Creates More Noise

In response to early uncertainty, some organisations instinctively try to regain control by expanding the scope of testing. Additional scripts are introduced, edge cases are layered in, and coverage increases rapidly.

While this approach may feel thorough, it often creates more noise than clarity. Excessive testing volume can lead to fatigue, reduced engagement, and difficulty identifying what truly matters. Critical issues risk being buried within a growing list of minor defects.

Effective UAT is not about testing everything. It is about testing the right things. The focus should remain on core business processes, high-risk transactions, and the user journeys that will define day one operations. Thoroughness is not measured by volume, but by relevance.

3. When UAT Starts Without a Clear Framework

At the other end of the spectrum are teams that enter UAT without a clearly defined structure. There may be no test plan or shared understanding of what “ready for UAT” looks like, no consistent definition of defect severity, and no agreed cadence for triage and decision-making.

Under these conditions, testing activity begins, but control is limited. Ownership becomes unclear, and prioritisation can shift depending on who is raising the issue rather than the impact it carries. UAT quickly becomes reactive.

The difference between a calm, controlled UAT phase and a chaotic one is rarely the number of issues identified. It is the presence of a framework that enables those issues to be understood, prioritised, and resolved in a structured way.

4. When Time and Capacity Are Treated as Flexible

Two of the most underestimated constraints in UAT are time and capacity.

Testing is often expected to be absorbed alongside business-as-usual responsibilities, with key users balancing operational demands and project commitments. At the same time, UAT timelines are frequently compressed to recover delays from earlier phases.

Effective UAT requires focus, consistency, and sufficient time for issues to be identified, resolved, and retested. Organisations that approach this phase successfully make deliberate choices to protect these elements. They ringfence key resources and recognise that UAT is not simply another activity, it is a critical pre-cursor for a successful go-live.

5. When Defect Management Lacks Discipline

As testing progresses, the way defects are managed becomes increasingly important. Without a single source of truth, consistent severity definitions, and a structured triage process, defect management can quickly become fragmented. Multiple tracking mechanisms emerge, ownership becomes blurred, and decision-making slows.

In these conditions, the issue is not the presence of defects — it is the lack of clarity around them. A disciplined approach to defect management provides visibility, enables prioritisation, and supports timely resolution. It ensures that conversations are grounded in impact rather than volume and that the team maintains control as complexity increases.

6. When Teams Try to Fix Everything at Once

As UAT progresses and go-live approaches, there is often a shift in focus. The objective moves from validation to optimisation. Additional enhancements are identified. Minor improvements begin to feel urgent. The desire to deliver a “perfect” system starts to influence decision-making. While this instinct is understandable, it introduces risk.

UAT is not designed to perfect the system; it is designed to confirm that it works. Attempting to address every enhancement during this phase can introduce unnecessary complexity and destabilise what has already been validated.

The most effective teams maintain a clear distinction between what is critical for go-live and what can be addressed afterwards. They prioritise outcomes over perfection and recognise that hypercare and future optimisation phases exist for a reason.

7. When UAT Becomes a Redesign Exercise

A related challenge emerges when UAT is used to revisit earlier design decisions. Questions around workflows, configurations, and process design begin to resurface. While these discussions may be valid, they are often occurring too late in the lifecycle to be addressed without consequence.

UAT is not a redesign phase. Its purpose is to validate that the agreed design operates as expected in a real-world context. When significant design questions arise during testing, it is often indicative of gaps in earlier stages of the project.

Maintaining discipline around phase intent is essential to preserving momentum and avoiding unnecessary rework.

8. When the “User” Is Missing from User Acceptance Testing

Despite its name, User Acceptance Testing does not always involve a representative group of end users. Testing is sometimes conducted primarily by the project team or a small group of subject matter experts who are deeply familiar with the system. While valuable, this perspective is not sufficient on its own.

End users bring a different lens. They interact with the system in ways that may not have been anticipated, and they identify usability challenges that structured testing alone may not uncover.

“Particularly when you’re implementing new rostering, clocking and time capture systems, the perspective of the people on the frontline, especially rostering managers, is critical during UAT” – Janelle Murphy, Senior Advisory Consultant, Pinpoint HRM

Without their involvement, acceptance is theoretical rather than real. Ensuring that representative users are engaged in UAT strengthens both validation and confidence heading into go-live.

9. When Early Defect Volume Is Misread

The early stages of UAT often generate a high volume of defects. For some stakeholders, this can be confronting and may be interpreted as a sign that ‘the configuration is wrong’ or the system is not ready.

In practice, early visibility is a positive indicator. It suggests that testing is being conducted thoroughly and that users are engaging meaningfully with the system. Issues identified early are significantly easier to address than those discovered later, when timelines are tighter and options are more limited.

The real risk lies not in high early volumes, but in late-stage surprises. Effective teams focus on trends, severity, and resolution rates rather than absolute numbers.

10. When the Team Expects Certainty Instead of Learning to Live with Uncertainty

Perhaps the most challenging aspect of UAT is accepting that it cannot eliminate all uncertainty. As go-live approaches, there is a natural desire for complete assurance. Stakeholders want confidence that the system will perform as expected, that risks have been mitigated, and that nothing material has been overlooked.

However, any form of testing is not designed to provide absolute certainty. It is conducted in a controlled environment, with defined scenarios and known data. Real-world conditions are inherently more complex. Users behave unpredictably. Edge cases emerge.

There will always be a degree of uncertainty. High-performing teams recognise this and approach it differently. Rather than seeking complete assurance, they focus on understanding the risks that remain and determining whether those risks are acceptable. They document residual risks, align on mitigation strategies, and move forward with clarity.

“This is so often the time when projects can derail when expectations are not managed well. Project Sponsors need to lean in heavily during testing to ensure the team’s morale is managed, ‘calm the farm’ and to provide the executive decision making to support a timely go-live.” – Hayley Parker, Head of Strategy, Pinpoint HRM.

At this point, UAT shifts from a testing exercise to a leadership one.

Final Thoughts

Well-executed UAT or any element of testing is rarely dramatic. It is structured, measured, and controlled. Issues are identified, but they are understood. Decisions are made with clarity, and the overall trajectory of the project remains steady.

The difference is rarely the system itself. It is the presence of discipline, structure, and calm leadership throughout the phase. Because by this stage, the system is not the only thing being tested. The team is.

You can overcook it. You can undercook it. You can panic. You can perfection-hunt.

Or you can choose clarity, calm, control and confidence.

Because the problem isn’t U-AT.
It’s how U-ACT.