What Are the WHO Health System Building Blocks?

The WHO health system building blocks are a framework of six core components that the World Health Organization uses to describe how any health system functions: service delivery, health workforce, health information systems, access to essential medicines, health financing, and leadership and governance. Introduced in WHO’s 2007 report “Everybody’s Business: Strengthening Health Systems to Improve Health Outcomes,” the framework has become the most widely referenced tool for analyzing, comparing, and strengthening health systems around the world. Its appeal lies in its simplicity, but the real story is in how the six pieces depend on each other and where the framework falls short.

The Six Building Blocks at a Glance

Before getting into how these blocks work in practice and where they break down, it helps to see what each one covers. The WHO treats these as the essential inputs that any functioning health system needs.

Service delivery: The actual provision of health services to people, including everything from preventive screenings and vaccination campaigns to hospital care and rehabilitation. Good service delivery means services are effective, safe, and accessible to those who need them.
Health workforce: The people who deliver care and keep the system running. This includes doctors and nurses, but also community health workers, pharmacists, lab technicians, and managers. Having enough workers with the right skills in the right locations is arguably the single hardest challenge most countries face.
Health information systems: The infrastructure for collecting, analyzing, and using data. This covers disease surveillance, patient records, vital statistics like births and deaths, and routine reporting from health facilities. Without reliable data, decision-makers are guessing.
Essential medicines and technologies: Ensuring that drugs, vaccines, diagnostic tools, and medical devices are available, affordable, and of adequate quality. A clinic with trained staff but no medicines or functioning equipment cannot deliver much.
Health financing: How money is raised, pooled, and spent. This block determines who pays for care, how much financial protection people have, and whether the system can sustain itself over time.
Leadership and governance: The oversight function. This includes setting strategic direction, making and enforcing regulations, ensuring accountability, and coordinating the other five blocks so they work together rather than at cross-purposes.

The framework was originally linked to an earlier WHO model that described health system performance as a function of four key functions: stewardship, financing, service provision, and resource generation.¹ The six-block version expanded and reorganized those functions into a more granular checklist that countries and international organizations could use as a common language.

Service Delivery and What Makes It Work

Service delivery is the block that patients experience directly. It is also the one most shaped by all the other blocks. A country can have beautiful hospitals and well-written clinical guidelines, but if the workforce is thin, medicines are out of stock, and data systems cannot track who needs what, service quality collapses.

What influences whether people actually benefit from health services goes well beyond clinical skill. Research in China found that patient satisfaction with service delivery hinges on factors like how well doctors communicate, how long people wait, how much care costs, and whether patients trust their provider’s prescriptions and recommendations. Those drivers varied depending on whether patients used low-level public hospitals, high-level public hospitals, or private facilities.² That variation is a reminder that “service delivery” is not one thing; it differs by facility type, setting, and population.

In rural and crisis-affected areas, the service delivery picture is bleaker. A baseline study in Zambia found that weaknesses in service delivery were directly tied to shortages of health workers, unreliable supplies, poor information flow, and weak governance and financing.³ Service delivery is, in effect, the visible output of how well (or badly) the other five blocks are functioning.

The Health Workforce Crisis

If any building block deserves the label “crisis,” it is the health workforce. Globally, there are not enough health workers, and the ones who exist are concentrated in wealthier countries and urban areas. The COVID-19 pandemic made an already strained situation worse: health workers faced higher infection risks, burnout, mental health strain, and stigma, all of which accelerated attrition from the profession.⁴

Rural and remote areas are hit hardest. Getting health workers to move to underserved areas is one challenge; keeping them there is another. A scoping review of workforce retention strategies found that interventions generally fell into three categories: education-to-employment pathways that train people locally, financial incentives like higher pay or loan forgiveness, and personal and professional support such as better housing or mentorship programs. The review found evidence that all three approaches had some impact, but researchers rarely documented how successful programs were actually implemented or evaluated at the organizational level.⁵ That gap matters because knowing that “financial incentives help” does not tell a district health manager exactly how to design or fund a program that works in their setting.

Health Information Systems and the Data Problem

A health information system is not just a database. It is the mechanism through which a country tracks disease outbreaks, monitors health facility performance, manages supply chains, and allocates resources. A functional and reliable health information system is vital for data-based decision-making in public health.⁶

In many low- and middle-income countries, the reality falls far short. Paper-based records, incomplete reporting, and fragmented digital systems mean that data either does not exist or cannot be used in time to matter. Post-crisis settings face even steeper challenges. Research on health system recovery in Gaza, for instance, emphasized that restoring the health information system should position it as a “central nervous system” for care coordination, financial accountability, and supply chain management, with a focus on interoperability and actionable analytics.⁷ That framing captures the ambition, even as the gap between ambition and reality remains enormous in many places.

Essential Medicines and Supply Chains

Having medicines and medical technologies available sounds straightforward, but in practice it is one of the most operationally complex challenges in health systems. Supply chains can fail at every stage: forecasting demand, procurement, transportation, storage, and last-mile delivery to health facilities.

Research on medicine shortages in Saudi Arabia’s Ministry of Health system identified several strategies that health professionals endorsed for mitigating those gaps. These included training medical staff on alternative medications, creating authorized inventories of critical and life-saving items for rapid distribution, enforcing restrictions on appropriate use during shortages, closely monitoring stock movement, and establishing backup contracts with alternative suppliers.⁸ These are practical fixes, but they also underscore how fragile supply chains are even in a relatively well-resourced country.

In lower-income settings, the picture is grimmer. Medicine stockouts at health facilities are a routine occurrence in many sub-Saharan African countries, and they undermine trust in the health system as a whole. People who travel hours to a clinic only to be told there is no medication stop coming, and preventable conditions go untreated.

Health Financing and Financial Protection

How a country pays for health care is not just an accounting question. It determines whether people can access services without falling into poverty. Globally, hundreds of millions of people face financial hardship because they have to pay for health care out of their own pockets at the point of use.

A retrospective study covering 133 countries found that simply increasing the share of a country’s economy spent on health was not sufficient to reduce the incidence of catastrophic out-of-pocket spending. What mattered more was increasing the share of total health expenditure that was prepaid, particularly through taxes and mandatory contributions.⁹ In plain terms, how the money is collected matters more than how much money there is. A health system that relies heavily on people paying when they get sick, rather than pooling funds in advance, will produce financial ruin for the unlucky regardless of total spending levels.

This insight has shaped how global health organizations frame universal health coverage. The push is not just for more health spending but for better health financing: broader risk pools, reduced reliance on out-of-pocket payments, and strategic purchasing that links spending to actual health needs rather than political preferences.

Leadership, Governance, and Stewardship

The sixth building block, leadership and governance, is sometimes described as the glue that holds the other five together. The WHO’s original 2000 World Health Report used the term “stewardship” to capture this function, defining it broadly as the accountability of the health system and, ultimately, for the health of the population.¹⁰ Governance and leadership, in this framing, are subdivisions of stewardship that include strategic policy frameworks, effective monitoring, building coalitions, regulation, system design, and accountability.

A comparative study of leadership and governance across seven developed health systems proposed that three fundamental functions sit at the core: priority setting, performance monitoring, and accountability arrangements. Of these, accountability was where the greatest variation occurred and where uncertainty about the best approach was highest. The study concluded that most settings probably need a mix of accountability mechanisms, including market incentives, electoral processes, direct financial incentives, and professional oversight.¹¹ There is no one-size-fits-all model, which is both the realistic conclusion and the frustrating one.

Legal frameworks play a foundational role. An overview of stewardship and health systems strengthening identified several recurring themes: the foundational role of law for effective stewardship, the importance of institutional arrangements as enablers, the influence of regional and global entities on national stewardship, and pathways to sustainable financing and domestic resource mobilization.¹² Without the legal scaffolding to enforce regulations and hold actors accountable, the best-designed policies remain aspirational.

Why the Blocks Cannot Be Treated in Isolation

The building blocks framework is often drawn as a tidy diagram with six labeled boxes, which can create the misleading impression that each block operates independently. In reality, the blocks are deeply interconnected, and a weakness in one cascades through the others.

The Zambia baseline study mentioned earlier demonstrated this clearly. Challenges in service delivery were linked, directly or indirectly, to problems in human resources, medical supplies, information flow, governance, and finance. The researchers described this as an essential element of systems thinking: the recognition that building-block-specific weaknesses have cross-cutting effects across the entire health system.³

An assessment of Nigeria’s primary health care system offered a concrete illustration of this dynamic. The country had a reasonable density of health facilities and workers on paper, yet the system underperformed because of segmented supply chains, poor financial access for patients, lack of drugs and equipment at the facility level, and weak health worker performance. The researchers traced these dysfunctions back to two overarching root causes: financing and governance.¹³ In other words, the “upstream” blocks of financing and governance shaped everything downstream, from whether clinics had medicines to whether health workers showed up motivated.

Criticisms and Gaps in the Framework

The building blocks framework has earned its share of criticism. The most common complaint is that it is too focused on facility-based, specialist-driven care and neglects community health. A critique by Sacks and colleagues, noted in a review of the building blocks in rural community settings, suggested expanding the framework to explicitly include community health, arguing that without such attention, policymakers and funders tend to center their efforts on facilities and specialists.¹⁴ For countries where most people get their care from community health workers, traditional healers, or informal providers, a framework that does not account for community-level systems is missing a large piece of the picture.

Another criticism is that the framework is better at describing a health system’s components than at capturing the dynamics between them. The boxes-on-a-page presentation implies a static system, when in reality health systems are constantly shifting in response to political decisions, economic shocks, disease outbreaks, and demographic changes. Researchers have argued that the framework needs to be paired with systems thinking approaches that explicitly model how changes in one block ripple through the others. A related limitation is that the framework says nothing about demand-side factors like health literacy, cultural beliefs, or geographic barriers to access, all of which powerfully shape whether people actually use services that exist on paper.

Decentralization and Local Governance

Many countries have decentralized health system management to subnational governments, and this is where the building blocks framework meets messy political reality. Decentralization, in theory, brings decision-making closer to the communities that health systems serve. In practice, the evidence is mixed.

Nepal’s transition to a federal system, for example, created both opportunities and challenges mapped across the building blocks. On the positive side, municipalities could tailor health policies to local needs, improve outreach services, increase health budgets and staffing, and get faster data reporting from facilities. But the process also produced poor coordination between tiers of government, delayed release of funds, maldistribution of staff, procurement problems, and limited monitoring of service quality and data accuracy.¹⁵

A systematic review of reviews on decentralization and health systems found a pattern of increased opportunities for corruption following decentralization, including political interference in health worker recruitment, local authorities meddling in decision-making, nepotism, and low budget transparency. At the same time, decentralization did not necessarily widen the decision-making space for local jurisdictions in practice; the degree to which subnational governments could genuinely influence health systems varied widely.¹⁶

Kenya’s devolved health system illustrates the financing dimension of this problem. A policy analysis of eye health integration found that while the national strategy provided direction, it did not mandate budget allocations at the county level. Counties had varying degrees of policy documentation, and while budget estimates existed, actual expenditure could not be traced because resources were often embedded in broader allocations.¹⁷ Decentralization created the legal space for local health spending decisions, but it did not automatically create the capacity or transparency to follow through.

Using the Framework in Pandemic Response

The COVID-19 pandemic stress-tested health systems everywhere, and the building blocks framework provided a useful lens for analyzing what worked and what did not. Oman’s accelerated COVID-19 mass vaccination campaign was examined through the building blocks framework to draw lessons about health system preparedness and effective responses to public health emergencies.¹⁸ By assessing each block’s contribution to the campaign, researchers could identify which system strengths enabled rapid rollout and where gaps created bottlenecks.

Research on post-crisis recovery in Gaza also used the framework to develop a roadmap. The findings emphasized that technical recovery alone is not enough; socio-political issues had to be addressed simultaneously. Recommendations included rehabilitating primary healthcare networks with digital referral systems, providing comprehensive workforce support for retention and capacity building, restoring health information systems with interoperability at the center, and creating a transparent multi-year national health recovery fund to reduce reliance on donor financing. The study also found a significant perception gap between policymakers and implementers regarding governance, highlighting the need for an inclusive steering platform.⁷

Climate Resilience and Emerging Applications

The building blocks framework is being stretched into new territory as global challenges evolve. Climate change is one increasingly urgent area. The WHO has developed an Operational Framework for Building Climate Resilient Health Systems, which maps climate adaptation strategies onto the existing building blocks structure.¹⁹

A rapid review focused on malaria control in sub-Saharan Africa argued that public-private partnerships should be harnessed to implement this climate resilience framework, noting that partnerships remain a viable alternative despite the challenges they face.²⁰ As climate change shifts disease patterns, strains supply chains, and displaces populations, the building blocks framework offers a starting point for thinking about where health systems need to adapt, even if the original framework was not designed with climate in mind.

Traditional and Complementary Medicine

One area where the building blocks framework is being applied in surprising ways is the integration of traditional and complementary medicine into formal health systems. A systematic review on this topic mapped the factors affecting integration according to the six building blocks, covering service delivery, governance and financing, medical products, health information systems, workforce considerations, and service standards.²¹

The WHO’s Global Traditional Medicine Strategy 2025–2034 aims to enhance the contribution of traditional and complementary medicine to universal health coverage by strengthening its evidence-based integration into national health systems.²² This represents a recognition that in many parts of the world, traditional medicine is not a fringe alternative but a first point of contact for large portions of the population. Using the building blocks to guide that integration, rather than treating traditional medicine as a separate domain entirely, is a pragmatic move toward health systems that reflect how people actually seek care.

1
Bulletin of the World Health Organization. A WHO Framework for Health System Performance Assessment
2
BioMed Central / PubMed Central. The influences of patient’s satisfaction with medical service delivery, assessment of medical service, and trust in health delivery system on patient’s life satisfaction in China
3
PubMed Central. Systems thinking in practice: the current status of the six WHO building blocks for health system strengthening in three BHOMA intervention districts of Zambia: a baseline qualitative study
4
Human Resources for Health. The global health workforce stock and distribution in 2020 and 2030: a threat to equity and ‘universal’ health coverage?
5
PubMed. Improving rural and remote health workforce retention amid global workforce shortages: a scoping review of evaluated workforce interventions
6
Discover Health Systems. Health information systems data for decision-making: case study in three cities on current practices and opportunities
7
European Journal of Public Health. IFPHOR0054 A Roadmap for Post-Crisis Health System Recovery in Gaza Based on the WHO Health System Building Blocks Framework
8
Informatics in Medicine Unlocked. Analyzing the causes and impact of essential medicines and supplies shortages in the supply chain of the Ministry of health in Saudi Arabia: A quantitative survey study
9
PubMed. Progress on catastrophic health spending in 133 countries: a retrospective observational study
10
PubMed Central. Stewardship in Health, Designing a Multi-Layer Meta Model: A Review Article
11
PubMed. Leadership and governance in seven developed health systems
12
Public Administration and Development. Stewardship and health systems strengthening: An overview
13
Taylor & Francis Online (Health Systems & Reform). Assessment of Primary Health Care System Performance in Nigeria: Using the Primary Health Care Performance Indicator Conceptual Framework
14
PubMed Central. World Health Organization building blocks in rural community health services: An integrative review
15
PubMed Central. Overcoming the challenges facing Nepal’s health system during federalisation: an analysis of health system building blocks
16
Journal of Health Services Research & Policy. The impact of decentralisation on health systems: a systematic review of reviews
17
PubMed Central. From national strategy to local implementation: a policy analysis of eye health integration and financing in Kenya’s devolved health system
18
PubMed Central. The Experience of an Accelerated COVID-19 Immunization Campaign in Oman: A Review Within the WHO Health System Building Blocks Framework
19
Sushruta Journal of Health Policy & Opinion. How to Build Climate Resilient Health Systems
20
PubMed Central. Challenges and opportunities for greater public-private partnership for the implementation of the WHO operational framework for building climate resilient health systems to improve malaria control and elimination in Sub-Saharan Africa: a rapid review
21
PubMed. Integration of traditional and complementary medicine into primary health care systems: a systematic review
22
PubMed. Policy implications of WHO’s Global traditional medicine strategy 2025-2034