Reframing Human Behaviour Through the Behavioural Triangle: A Relational Systems Model for Understanding and Change

J Health Behav Med Hist 2025-12.

Reframing Human Behaviour Through the Behavioural Triangle: A Relational Systems Model for Understanding and Change

Robert C. van de Graaf, MD, director
MEDTCC Institute for Health, Behaviour, Medicine and its History, The Netherlands

Abstract

Human behaviour is often interpreted through an individualistic lens—explained by motivation, discipline, or personality. Yet this reductionist view neglects the dynamic system in which behaviour occurs. This paper presents the TOPFIT Behavioural Triangle©, a relational systems model that conceptualizes behaviour as the result of interaction between three active agents: Person, Task, and Organisation. Crucially, the model distinguishes between general behaviour (the abstract, neutral action, the Task) and visible behaviour (the concrete enactment in context). The quality of relationships between the three agents—each asking something of, and offering something to, the others—determines whether behaviour emerges with friction or flow. By illuminating these relationships, the model offers a robust framework for diagnosing behavioural issues, initiating meaningful dialogue, and designing more supportive systems. The paper integrates insights from behavioural science, neurobiology, and organisational dynamics, and builds on earlier work describing the model’s development and evolution.

Introduction: From Individual Blame to Relational Insight

Modern approaches to behaviour often place the burden of change on individuals. Whether in healthcare, education, work, or public health, the narrative is clear: you must change. But human behaviour is rarely an isolated choice. It is the visible outcome of a system—shaped by tasks, expectations, culture, and context.

This paper proposes a shift from individual-centric models to a relational, systems-based understanding of behaviour. The TOPFIT Behavioural Triangle© offers a framework that respects human complexity, avoids moralisation, and supports change by analysing the fit between person, task, and environment. This model builds on over two decades of interdisciplinary clinical practice, health promotion, and system-level intervention, and offers both conceptual clarity and practical tools.

Behaviour as Emergent Phenomenon: The Triangle Model

The TOPFIT Behavioural Triangle© consists of three mutually interacting agents:

• Task (T): The abstract behaviour in general terms (e.g., walking, speaking, collaborating), which is neutral and not yet shaped by personal or contextual circumstances.
• Organisation (O): The environment or context in which the behaviour occurs—ranging from formal institutions to informal social norms, material structures, and implicit rules.
• Person (P): The individual performing the behaviour, with specific needs, capacities, preferences, energy levels, identity, and social biography.

Each element is active. The person interprets and enacts the task; the task invites or resists engagement; the organisation enables, constrains, or reinforces behaviour. In this view, behaviour is not a fixed trait, but a relational phenomenon—emerging from the dynamic interplay of these three agents.

General vs. Visible Behaviour: A Crucial Distinction

Central to the triangle is the distinction between:

• General behaviour: Behaviour in abstract form, available to anyone and context-independent. For instance, “running” as a general task requires certain physical capabilities, but is not yet personalised or situated.
• Visible behaviour: The actual, context-specific enactment by a particular person in a particular setting. “Sarah runs 5 km at 6 a.m. in the rain after a night shift” is visible behaviour—shaped by energy, context, norms, and personal meaning.

This distinction is vital. When people struggle with a behaviour, the issue often lies not in the task itself, but in the fit between the person, the task, and the organisation. Diagnosing the system—rather than blaming the person—unlocks more ethical and effective interventions.

The Relational Quality: From Friction to Flow

The triangle is not static. It operates through relationships—and those relationships have quality. Each dyadic link (T–O, P–T, O–P) involves both demands and offerings. Each agent asks something from the other, and provides something in return.

• Task–Organisation (T–O): The task exists within and serves the organisation. The organisation offers structure and tools, but may also constrain or overdefine the task. Alignment here determines feasibility and value.
• Person–Task (P–T): The task requires attention, effort, or skill. In return, it may offer purpose, satisfaction, or structure. Misfit leads to boredom or overload; good fit creates flow.
• Organisation–Person (O–P): The organisation provides recognition, support, and safety; the person contributes time, energy, and engagement. When trust and fairness are lacking, this relationship breaks down.

These reciprocal dynamics form what can be called the relational architecture of behaviour. If one link is weak or exploitative, behaviour becomes unstable. If all links are mutually supportive, behaviour becomes energising and sustainable.

In practice, visible behaviours such as absenteeism, resistance, perfectionism, or disengagement often reflect relational symptoms—signals of deeper mismatches. The triangle provides a non-blaming lens for diagnosis and intervention.

Neuroscience and Evolution: Why the Triangle Resonates

Human behaviour is shaped less by conscious deliberation than by automatic systems. From an evolutionary and neurobiological perspective, we are wired to seek safety, social belonging, and energy efficiency. Our so-called “animal brain” governs much of our daily activity, relying on habit, emotion, and group norms. The reflective cortex intervenes rarely—and only under stress or novelty.

This explains why behaviour is deeply contextual. We do not merely choose; we respond. Most of our actions are not strategic decisions, but adaptations to environment, task demands, and social signals.

The TOPFIT Behavioural Triangle© reflects this reality. It treats the organisation not as passive backdrop but as active co-creator of behaviour. The model validates what practitioners already sense: that most behavioural issues are not motivational deficits, but design failures. Better behaviour is not forced—it is invited through fit.

Model Development and Theoretical Integration

The development of the TOPFIT Behavioural Triangle© is detailed in an earlier publication (Van de Graaf, 2025). It builds on and critiques existing behavioural frameworks. While each of those models offers valuable insights, they often treat behaviour as an outcome rather than a relational actor. The TOPFIT model goes further by positioning behaviour as both a product and a signal of systemic fit.

Moreover, the model incorporates relational motivation—the idea that what people do depends not just on internal drives but on how well they fit with what they’re being asked to do, and where they’re being asked to do it.

Applications: Diagnosis, Dialogue, Design

The triangle model lends itself to three strategic applications:

a) Diagnosis

Analyse visible behaviour through relational fit. What is not working—and where is the mismatch? Is it a task overload, a lack of organisational support, or a misaligned identity?

b) Dialogue

Use the model as a neutral language to foster reflection between stakeholders. What does each party offer, and what do they need? How can expectations be clarified and rebalanced?

c) Design

Shape environments and roles that invite healthier behaviour. Fit is not found—it is designed. Sustainable behavioural systems require attention to reciprocity, flexibility, and shared meaning.

Beyond Behaviour: Reclaiming Human Functioning

Ultimately, the TOPFIT Behavioural Triangle© is more than a model of behaviour. It is a lens for understanding functioning. Behaviour is not simply action—it is a form of systemic feedback. When people smoke, withdraw, disengage, or overperform, they are not merely misbehaving. They are signalling misfit.

This perspective invites compassion over correction, and transformation over control. It reframes dysfunction not as failure, but as an opportunity to restore relational health. In times of rising burnout, disengagement, and chronic disease, such a lens is no longer optional—it is essential.

References

• Van de Graaf, R.C. (2025). The Evolution of a Behavioural Model: How the Triangle Shaped My Thinking. Journal of Health Behaviour, Medicine and History, 2025-1.