Health System Structure and Function

Health system structure and function describes the components a health system is built from and how those components work together to produce health services and health. The dominant framing decomposes the system into interacting building blocks — service delivery, workforce, information, medicines, financing, and governance — and links their structure to the functions of providing, financing, regulating, and stewarding care.

Definition

Health system structure refers to the components and configuration of a system — its facilities, workforce, financing, information systems, supplies, and governance — while function refers to the activities those components carry out: delivering, financing, regulating, and stewarding health services.

Scope

The topic covers the building-block model and related component frameworks, the relationship between structure (how the system is configured) and function (what it does), and the Donabedian structure-process-outcome logic used to reason about performance. It treats the system as an organizational object of study and is not a manual for configuring a specific organization.

Core questions

• What are the essential components of a health system and how are they configured?
• How does structure relate to the functions of delivery, financing, regulation, and stewardship?
• How can the linkage from structure to process to outcome be used to reason about performance?
• How do component frameworks differ across high-income and low- and middle-income systems?

Key concepts

• Service delivery
• Health workforce
• Health information systems
• Essential medicines and supplies
• Health financing
• Leadership and governance
• Structure-process-outcome
• System functions vs. components

Key theories

Six building blocks

The WHO framework that treats a system as six interacting components — service delivery, health workforce, health information systems, access to essential medicines, financing, and leadership/governance — whose combined functioning yields improved health, responsiveness, financial protection, and efficiency.

Structure-process-outcome

Donabedian's framework distinguishing the structural attributes of care settings, the processes of care delivered, and the outcomes achieved, and using the links among them to infer and assess quality.

Mechanisms

Structure and function are linked because the configuration of components constrains what the system can do: financing arrangements shape which services are affordable, workforce distribution shapes where care is available, and information systems shape whether performance can be observed and steered. The structure-process-outcome logic formalizes one direction of this linkage, treating good structures as enabling good processes, which in turn make good outcomes more likely — while recognizing that the links are probabilistic rather than guaranteed.

Clinical relevance

Structural and functional features of a system — staffing levels, information flow, referral arrangements — shape the conditions under which clinical care is delivered. This topic explains how systems are configured and assessed; it is descriptive background for management and policy reasoning and does not direct individual patient care.

Epidemiology

Studies of delivered care show substantial gaps between recommended and actual care even in well-resourced systems, illustrating that adequate structure does not automatically produce high-quality processes; structural constraints are more severe in low- and middle-income settings where workforce, financing, and supply components are thinner.

History

Donabedian's mid-twentieth-century work gave the field its enduring structure-process-outcome vocabulary, and the WHO building-blocks framework (2007) later provided a shared component model for describing and comparing whole systems. Comparative analyses of high-income and low- and middle-income systems sharpened the understanding that the same components function very differently depending on resources and organization.

Debates

Do the building blocks capture how systems actually behave?

Critics argue that listing components understates the dynamic interactions and emergent behaviour of systems, and that a more systems-thinking-oriented view is needed to explain why similar inputs produce different results.

Key figures

• Avedis Donabedian
• Anne Mills
• Marc Roberts
• Elizabeth McGlynn

Seminal works

• who-2007-building-blocks
• donabedian-1988
• mcglynn-2003

Frequently asked questions

What is the difference between health system structure and function?

Structure is what the system is made of and how it is arranged — facilities, workforce, financing, information, supplies, governance — while function is what it does with those components: delivering, financing, regulating, and stewarding care.

Why is the structure-process-outcome framework useful?

It gives a disciplined way to reason about quality by distinguishing the conditions of care, the care actually delivered, and the results achieved, and by examining the links between them.