The World Health Organization (WHO) is a specialized agency of the United Nations responsible for international public health. Its organizational structure is designed to facilitate global health leadership, standard-setting, and support to Member States, while its funding model supports these extensive operations.

Organizational Structure:

1. World Health Assembly (WHA):

   • Highest Decision-Making Body: Composed of delegates from all 194 Member States, it is WHO's supreme governing body.
   • Functions: The WHA determines the policies of the Organization, approves the budget, reviews and approves the Director-General's reports, and elects the Director-General. It meets annually, usually in May, in Geneva.

2. Executive Board:

   • Composition: Consists of 34 technically qualified members elected for three-year terms by the WHA. Members are chosen from different regions.
   • Functions: The Executive Board implements the decisions and policies of the WHA, advises it, and generally facilitates its work. It meets twice a year, with a main meeting in January and a shorter one in May, immediately after the WHA.

3. Secretariat:

   • Director-General: The chief technical and administrative officer of the Organization, elected by the WHA for a five-year term. The Director-General leads the Secretariat and is responsible for its day-to-day operations.
   • Staff: Comprises thousands of health experts, doctors, scientists, epidemiologists, administrators, and support staff working at the headquarters, regional offices, and country offices.
   • Functions: The Secretariat carries out the technical and administrative work of WHO, including setting norms and standards, providing technical assistance to countries, conducting research, monitoring health trends, and coordinating responses to health emergencies.

4. Regional Offices (6):

   • WHO has six regional offices, each serving a specific geographical area: Africa (AFRO), Americas (PAHO), South-East Asia (SEARO), Europe (EURO), Eastern Mediterranean (EMRO), and Western Pacific (WPRO).
   • Each region has a Regional Committee (composed of health ministers of Member States in that region) and a Regional Director (elected by the Regional Committee and endorsed by the Executive Board).
   • Functions: Regional offices adapt global policies to regional contexts, provide technical support to countries within their region, and coordinate regional health initiatives.

5. Country Offices:

   • WHO maintains country offices in most Member States, headed by a WHO Representative.
   • Functions: These offices work directly with national governments to implement WHO programs, provide technical assistance, and respond to national health priorities and emergencies.

Funding of the World Health Organization:

WHO's funding comes primarily from two sources:

1. Assessed Contributions (AC):

   • Mandatory Dues: These are mandatory contributions paid by Member States, calculated based on a country's wealth and population (similar to UN contributions).
   • Purpose: Historically, assessed contributions formed the backbone of WHO's budget, providing a stable and predictable funding base for its core functions, administrative costs, and fundamental public health activities. However, their share has significantly decreased over time.

2. Voluntary Contributions (VC):

   • Largest Source: Voluntary contributions now constitute the vast majority (over 80%) of WHO's budget.
   • Sources: These come from Member States (beyond their assessed contributions), intergovernmental organizations (e.g., World Bank, European Commission), philanthropic foundations (e.g., Bill & Melinda Gates Foundation), private sector entities, and other non-governmental organizations.
   • Nature: A significant portion of voluntary contributions is 'specified' or 'earmarked' for particular programs, diseases, or geographical areas. While this allows donors to direct funds to their priorities, it can limit WHO's flexibility in allocating resources according to global health needs and its own strategic priorities, potentially distorting its agenda.

Challenges: The heavy reliance on earmarked voluntary contributions poses challenges to WHO's financial independence and ability to respond to emerging global health threats effectively and equitably. There is an ongoing debate about increasing the share of flexible, unearmarked assessed contributions to ensure WHO's core functions are adequately and predictably funded.

In essence, WHO's structure allows for global policy-making, regional adaptation, and local implementation, while its complex funding model, though largely dependent on voluntary contributions, supports its critical and expansive role in global health governance.