Safety and quality in healthcare: why the distinction is important

About twenty-five years ago, when I was leading clinical quality in a large NHS trust, I grew increasingly concerned that my colleagues were thinking about quality in a one-dimensional way. They focused almost entirely on clinical outcomes, important, of course, but they overlooked patients’ own perceptions of their care. More troublingly, they struggled to define what “safe care” looked like, and they regularly confused good outcomes with safety. That confusion has not gone away. If anything, it has become more consequential as our systems grow more complex.

In response, I began describing quality as having three distinct but overlapping dimensions: safety, outcomes, and patient experience. The critical word was “overlapping”. These are not separate silos; they are interdependent. You cannot have good outcomes without safety, nor safety without good outcomes. The model was never intended as a definition of quality; it was a conceptual tool to prompt more careful thinking.

What troubles me is that this tripartite model has since hardened into something it was never meant to be, a rigid definition that inadvertently encourages trade-offs between its components. The suggestion, heard more often recently, that healthcare has been “too focused on safety and not enough on clinical outcomes” is precisely the kind of false choice this model, poorly understood, makes possible. It is wrong. Safety and outcomes must be assessed independently to avoid confusion, but they should never be traded against one another.

New learning from HSSIB addresses the question directly

HSSIB colleagues have now tackled this debate head on. A paper for the Chartered Institute of Ergonomics and Human Factors 2026 conference, “Quality versus safety in healthcare: a national debate for patient care”, by Woodier, Back, Owens, Vosper and Bowie, provides the most rigorous analysis of this question that I have seen produced within the NHS context. It deserves wide attention.

The paper draws on two sources of evidence, a structured discussion with safety professionals from across HSSIB’s workforce, people with backgrounds spanning healthcare, aviation, rail, nuclear, law, and psychology, and a systematic review of all 118 national safety investigation reports published by HSSIB and its predecessor HSIB since 2017. The findings are striking.

Forty-three of those 118 reports contained clear evidence of trade-offs between the “dimensions” of quality. In the overwhelming majority, safety lost out. Efficiency targets, timeliness pressures, experience initiatives, and patient-centred design goals had all, in documented cases, come at a cost to safety. The paper found no examples of the reverse, no cases where a focus on safety had demonstrably harmed other quality dimensions. This directly challenges the premise that a focus on safety comes at the expense of other aspects of quality.

The paper challenges the theoretical basis for treating safety and quality as equivalent, tradeable dimensions. Drawing on safety science literature, Rasmussen’s work on system drift, Hollnagel’s efficiency-thoroughness trade-off, and the concept of ALARP (as low as reasonably practicable), the authors argue that when resources are limited, reduced thoroughness is inevitable, and it is safety that is eroded. The idea of “balance” across quality dimensions, they conclude, is not just misconceived but structurally unsound.

From a dimensional model to a foundational one

The paper’s most important contribution is conceptual. The authors propose replacing what they call the “dimensional” model of quality (my tripartite model and its derivatives), in which safety sits alongside effectiveness, experience, efficiency, equity and accessibility as one of several equivalent domains, with a “foundational” model, in which safety is the base upon which all other quality dimensions are built.

This new conceptual model is one I find compelling. It resolves the trade-off problem at a structural level. If safety is simply a dimension of quality, it can be weighed against other dimensions under pressure. If safety is the foundation, it becomes a non-negotiable precondition, a “hard deck”, in the paper’s memorable phrase, below which organisations must not pass. The question ceases to be “how do we balance safety against quality?” and becomes “how do we pursue quality without degrading the safety foundation?” That is a fundamentally better question.

The paper is also right to flag the equity dimension. At HSSIB, we have increasingly recognised that safety and equity are deeply intertwined. Risks of harm are not distributed equally across patient populations; vulnerability, communication barriers, and structural disadvantage all affect safety. Any framework that treats equity as simply another quality metric, separable from safety considerations, will miss this.

Why this is important

The NHS is reorganising. National plans are being redrawn. In that context, the framing choices made about safety and quality are not merely academic, they will shape governance structures, inspection frameworks, resource allocation, and the culture of organisations for years to come. Getting this wrong has consequences that will impact patients.

It has been claimed that a focus on safety had come at the expense of other quality dimensions, and that the NHS should now seek “balance”. The Woodier et al. paper tests that claim against evidence and finds it wanting. More importantly, it explains why the concept of balance between different aspects of quality itself is part of the problem. Safety-critical industries, aviation, rail, nuclear, do not seek balance between safety and performance. They treat safety as the precondition for everything else. Healthcare needs to reach the same understanding.

Staff across the NHS are already finding it increasingly difficult to keep patients safe. This is not the moment to dilute the status of safety. It is the moment to strengthen it and to do so on the basis of evidence and sound safety science, not reactive policy.

A call for a rethink

The paper by Woodier and colleagues calls for a fundamental rethink of how the NHS views and prioritises patient safety, and for the consistent application of contemporary safety and risk management principles. HSSIB has previously recommended the development of safety management systems in healthcare; this paper strengthens the case.

As the paper concludes, by viewing safety as the foundation for quality, there is no “safety versus quality” dichotomy; this misconceived tension dissolves. What remains is a shared project, building quality care on safe systems, with safety and quality specialists working together rather than competing for the same limited resources and institutional attention.

Safety and quality in healthcare are inseparable but not synonymous. Treating safety as the foundation of quality, rather than one dimension among many, is not a semantic preference. It is the precondition for keeping patients safe.