The Capabilities Approach: Definition, Ten Central Capabilities and Criticisms

What the Capabilities Approach says

The Capabilities Approach evaluates well-being and justice by asking what people are genuinely able to do and to be. This shifts attention away from possessions, income and resources alone and toward the real freedoms those resources give people. Two people can have the same income while possessing very different opportunities because of disability, gender discrimination, poor health, social exclusion, unsafe environments or unequal access to institutions. A wheelchair user, for example, may have the same financial resources as another person but far fewer opportunities if public transport, buildings and workplaces are inaccessible.

The approach therefore asks a question that conventional measures of economic welfare can miss: what can this particular person actually achieve with the resources available to them? A legal right to education means little if a child cannot safely attend school. Having the formal right to vote does not provide the same political opportunity when intimidation or exclusion prevents meaningful participation. The distinction between formal possession of a resource and genuine opportunity is central to capability theory.

The approach became influential in development economics, welfare economics, political philosophy, law and human-rights thinking. It also provides an important foundation for understanding Nussbaum's broader philosophy. For her wider philosophical development and major works, see our Martha Nussbaum guide.

Resources, income and capabilities

The Capabilities Approach does not claim that income and material resources are irrelevant. Money can be extremely important because it allows people to obtain food, housing, healthcare, education, transportation and many other things. The argument is that resources are means to human well-being, not the final measure of well-being itself. What ultimately matters is what people can do and be with those resources.

Consider two people with identical incomes. One may be healthy, live in an accessible city and have supportive institutions, while the other may have a disability, live in an inaccessible environment and face discrimination. Their income is the same, but their effective opportunities are not. Similarly, two people with equal legal rights may experience very different freedoms because of social norms, violence, family restrictions or political exclusion.

This is why capability theorists resist reducing equality to the equal distribution of goods. The same resource can have very different value for different people. A capability-based analysis therefore examines the relationship between resources and the actual freedoms they produce.

What are conversion factors?

Conversion factors are the personal, social and environmental conditions that affect how successfully a person can turn resources into real opportunities. This idea helps explain why giving everyone exactly the same amount of a resource does not necessarily produce equal capabilities.

Personal factors can include age, physical condition, disability or health. Social factors include laws, discrimination, family structures, social norms and access to public institutions. Environmental factors include infrastructure, climate, geography, transportation and the accessibility of buildings. These factors can determine whether a resource actually expands someone's freedom.

For example, providing every citizen with the same public transportation pass does not create the same mobility capability if one person's route has wheelchair-accessible buses and another's does not. Likewise, giving every student the same textbook does not create equal educational opportunity if some students lack electricity, safe study conditions or freedom from discriminatory barriers. Conversion factors are therefore essential to understanding why equal resources can produce unequal capabilities.

Capabilities vs functionings

A capability is a real opportunity or freedom to do or be something, while a functioning is the achieved state or activity itself. Being able to vote is a capability; actually voting is a functioning. Having access to education is a capability; becoming educated is a functioning. Having sufficient food available is a capability, while being well nourished is a functioning.

Amartya Sen's well-known contrast between fasting and starving illustrates the distinction. Two people may both be without food, but their situations are not equivalent if one has chosen to fast while the other has no food available. Their achieved functioning is similar, but their capabilities are radically different because only one has the genuine option to eat.

The distinction is important because it protects individual choice. Nussbaum argues that a just society should secure important capabilities rather than force people to perform particular functionings. A society can make education genuinely available without forcing everyone to become a scholar. It can protect religious freedom without requiring people to practice a particular religion. The existence of a capability leaves room for individuals to decide how they will live.

The ten central capabilities

Nussbaum's version of the Capabilities Approach identifies ten central capabilities that she argues are fundamental to a life worthy of human dignity. The list is intended as a threshold for political justice rather than as a complete description of everything that makes a human life valuable. Every person should have the opportunity to reach at least a minimum level in each area.

The capabilities are deliberately broad. They cover basic survival, physical health, bodily security, imagination and education, emotional development, practical reasoning, relationships with others, concern for nature, recreation and participation in political and economic life. The list also reflects Nussbaum's belief that human flourishing has multiple dimensions that cannot be reduced to income, happiness or economic productivity.

Nussbaum's list is not intended to tell every individual what to value or how to live. Its purpose is to identify a set of basic opportunities that political institutions should protect for everyone. People may legitimately make very different choices once those opportunities are available.

Capabilities, human dignity and justice

For Nussbaum, the central concern behind the capabilities list is human dignity. A society is not just merely because it distributes goods equally if some people remain unable to live with basic bodily security, exercise practical reason, participate in social life or have a meaningful political voice. The question of justice therefore concerns the minimum conditions under which a person can live as an equal human being.

This gives the approach a different emphasis from theories that evaluate societies mainly by aggregate happiness or economic growth. Economic development can increase average income while leaving particular groups without basic opportunities. A capabilities perspective asks who benefits, who remains excluded and whether every individual has reached the relevant threshold.

The dignity-based perspective also explains why Nussbaum's list contains capabilities that are not obviously economic. Play, emotions, affiliation, political participation and practical reason may not directly increase income, but they are treated as important dimensions of a fully human life. Justice therefore cannot be reduced to producing economically productive citizens.

Thresholds and types of capability

Nussbaum presents her view as a partial theory of justice. The central political task is to ensure that every person reaches a minimum threshold of each central capability. A society that leaves people permanently below that threshold fails to meet an important requirement of justice, even if other aspects of the society are prosperous.

The threshold idea is important because Nussbaum is not claiming that everyone must possess exactly the same level of every capability. The theory establishes a minimum floor rather than demanding complete equality in every outcome. Once people are above the threshold, individuals can choose different ways of living and societies can debate additional priorities.

This also distinguishes the approach from a simple equality-of-resources theory. Justice may require giving different people different forms or amounts of support when their circumstances prevent them from converting resources into comparable opportunities. Equal treatment at the level of inputs does not always produce equal freedom at the level of capabilities.

Internal and combined capabilities

Nussbaum distinguishes between internal capabilities and combined capabilities. Internal capabilities are developed states or abilities within a person. They can include learned skills, physical development, emotional capacities and the ability to reason. They are not simply innate characteristics; they can develop through education, healthcare, practice and supportive social conditions.

A combined capability exists when an internal capability is combined with the external conditions necessary to exercise it. A person may have the internal ability to express a political opinion while lacking the combined capability if censorship, intimidation or exclusion prevents meaningful expression. Likewise, someone may possess the skills required for employment but lack a genuine work capability because discrimination or legal restrictions prevent access to suitable employment.

The distinction shows why capability justice cannot be achieved simply by changing individuals. Institutions and social environments also have to provide the conditions in which people's developed abilities can actually be used.

Adaptive preferences and the Capabilities Approach

The problem of adaptive preferences is closely connected to the Capabilities Approach. People living under long-term deprivation may adjust their desires and expectations to fit what they believe is possible. Someone who has never had access to education, healthcare or political participation may eventually stop expressing a desire for those things. Their subjective satisfaction therefore cannot automatically be treated as proof that their capabilities are adequate.

This creates a difficulty for theories that measure welfare primarily through happiness or preference satisfaction. If preferences are partly shaped by deprivation, then a person can report being satisfied while lacking important freedoms. Nussbaum uses this problem particularly in her discussions of women's lives and social inequality.

The capability perspective does not require every person to exercise every capability. Instead, it asks whether people possess meaningful opportunities before they choose. This distinction allows the approach to take individual agency seriously while still recognizing that unjust conditions can shape what people come to want.

Sen vs Nussbaum on the Capabilities Approach

Amartya Sen and Martha Nussbaum share the central insight that human well-being should be evaluated in terms of capabilities, but they develop the framework differently. Sen deliberately leaves the capability approach relatively open-ended. He emphasizes comparison, public reasoning and democratic processes for deciding which capabilities matter in particular evaluations. He is cautious about presenting a single universally fixed list imposed by a philosopher.

Nussbaum takes a more substantive route. She develops a list of ten central capabilities and argues that each person should be guaranteed a minimum threshold of them as a matter of justice. Her approach is therefore more directly connected to constitutional rights and political institutions. She also grounds the list in a conception of human dignity and draws on traditions including Aristotle and her interpretation of human flourishing.

The two approaches should not be treated as completely opposed theories. Nussbaum developed her position partly within the broader capability tradition associated with Sen, while Sen's work remains important for understanding the flexibility and democratic reasoning that characterize the wider approach. For a fuller comparison, see Nussbaum vs Sen.

Capabilities and human rights

Nussbaum's Capabilities Approach has a close relationship with the language of human rights, although the concepts are not identical. A right can establish a claim that a person has against institutions or other people, while a capability concerns the substantive opportunity that the person actually possesses. The distinction matters because a formal legal right may exist while the corresponding capability remains severely restricted.

For example, a constitution may guarantee freedom of political expression, but people may lack a meaningful political capability if intimidation, censorship or discrimination prevents them from speaking safely. Similarly, a legal right to education does not automatically create an educational capability if schools are inaccessible or children are systematically prevented from attending them.

The capabilities perspective therefore encourages institutions to look beyond formal guarantees and examine whether rights are translated into real opportunities. This is one reason the approach has been influential in discussions of development, gender equality, disability and social justice.

Origins and development of the Capabilities Approach

The modern capability framework is most closely associated with Amartya Sen. His 1979 Tanner Lecture, "Equality of What?", is widely recognized as a major early statement of the capability perspective. Sen challenged approaches that treated income, commodities or utility as sufficient measures of equality and instead asked about the substantive freedoms people possess.

Sen's ideas developed through his broader work in welfare economics, poverty, famine, inequality and development. The framework subsequently influenced development measurement, including the intellectual foundations behind the UNDP's Human Development Reports, which began in 1990. Measures such as the Human Development Index do not simply rank countries by national income; they incorporate dimensions such as health and education.

Martha Nussbaum developed a more explicitly philosophical and political version of the approach. Drawing on Aristotle, debates about human flourishing and other philosophical traditions, she developed her account around ten central capabilities and connected them to a threshold of human dignity. Her work applies the framework especially to gender, constitutional law, education, disability and global justice.

Where is the Capabilities Approach used?

The Capabilities Approach has been applied well beyond abstract debates in political philosophy. It has influenced discussions of human development, poverty, gender equality, disability, education, health, environmental justice and constitutional rights. Its flexibility comes from the fact that it asks what real opportunities people possess rather than assuming that a single economic indicator can capture every important dimension of human life.

• Poverty. Poverty can be understood as deprivation of important capabilities rather than simply as having an income below a particular monetary line.
• Gender equality. The approach can reveal inequalities that remain hidden when households are treated as if resources are automatically shared equally among their members.
• Disability. It draws attention to the environmental and institutional barriers that prevent people from converting resources into comparable opportunities.
• Education. Education is considered not merely as an investment in future earnings but as part of a person's ability to think, reason, imagine and participate in society.
• Health. The framework examines whether people have real opportunities to achieve and maintain health rather than measuring health only through spending or medical resources.
• Environmental justice. Access to a safe and sustainable natural environment can affect bodily health, security, affiliation and the ability to participate fully in human life.

Criticisms of the Capabilities Approach

The Capabilities Approach has been influential, but it faces significant philosophical and practical objections. Some critics question whether capabilities can be defined and compared with sufficient precision, while others worry that a theory based on a substantive conception of human flourishing may impose controversial values on people with different cultures and conceptions of the good life.

• Who decides the list? Critics question whether a philosopher should determine which capabilities are universally important. Sen places greater emphasis on democratic public reasoning and context-sensitive evaluation.
• Measurement. Income and other resources are comparatively easy to quantify, while capabilities such as practical reason, affiliation or emotional development are much harder to measure and compare.
• Paternalism. A government deciding which capabilities people must possess could potentially interfere with personal freedom. Nussbaum responds by distinguishing protected capabilities from compulsory functionings.
• Cultural disagreement. Different societies may disagree about the meaning or priority of particular aspects of flourishing. Defenders of the approach argue that basic dignity can coexist with substantial cultural variation above the minimum threshold.
• Individualism. Some communitarian and feminist critics argue that focusing primarily on individuals can understate the importance of relationships, communities, collective identities and social structures.
• Implementation. Even when governments agree on the importance of capabilities, turning broad philosophical principles into laws, budgets and measurable policy targets can be difficult.

Why does the Capabilities Approach matter?

The Capabilities Approach matters because it changes what we mean by equality, poverty and human development. Instead of asking only whether people have comparable incomes or resources, it asks whether they possess genuine opportunities to live lives they have reason to value. This makes differences in health, disability, discrimination, social norms and institutional access morally relevant rather than treating them as secondary complications.

Its most important contribution is perhaps the distinction between having something and being genuinely able to use it. A legal right, a sum of money or a public service does not automatically become a capability. People need the social, political, environmental and personal conditions that allow resources to translate into meaningful freedom.

In Nussbaum's version, the approach also provides a way to connect philosophical ideas about human flourishing with political demands for justice. The ten capabilities establish a minimum standard of dignity, while the distinction between capabilities and functionings preserves individual choice. This combination is central to why the approach remains influential in contemporary debates about justice and human development.

Frequently asked questions

What is the Capabilities Approach?

The Capabilities Approach is a way of evaluating well-being and justice by examining what people are genuinely able to do and to be, rather than measuring welfare through income, resources or subjective satisfaction alone.

Who created the Capabilities Approach?

Amartya Sen pioneered the modern capability framework, particularly through his work on welfare economics, inequality and development. Martha Nussbaum developed a more specific version based on ten central capabilities and a minimum threshold of human dignity.

What is the difference between a capability and a functioning?

A capability is a real opportunity to do or be something, while a functioning is the achieved activity or state itself. Being able to vote is a capability; actually voting is a functioning.

How many central capabilities does Nussbaum list?

Nussbaum identifies ten central capabilities: life; bodily health; bodily integrity; senses, imagination and thought; emotions; practical reason; affiliation; other species; play; and control over one's environment.

Why does Nussbaum use a threshold?

The threshold represents a minimum level of each central capability that she believes every person should be able to reach. The aim is not to make everyone live the same way but to prevent people from falling below basic conditions required for a life worthy of human dignity.

What is the difference between Sen's and Nussbaum's approaches?

Sen leaves the capability framework more open to democratic public reasoning and context-specific evaluation, while Nussbaum proposes a substantive list of ten central capabilities and argues that each should be protected above a minimum threshold.

Why are capabilities better than income as a measure of well-being?

Income is an important resource, but people differ in how effectively they can convert resources into real opportunities. Disability, health, gender discrimination, social norms and environmental conditions can all affect what a person is actually able to do with the same income.

What are adaptive preferences?

Adaptive preferences are desires that adjust to severely restricted circumstances. They matter to capability theory because a person may report satisfaction after becoming accustomed to deprivation, even while lacking important opportunities. This is one reason Nussbaum rejects subjective satisfaction as the sole measure of justice.