Social work theory · Volume G: Knowledge, Ethics & Professional Practice

Epistemology and philosophy of knowledge

Epistemology is the branch of philosophy concerned with the nature, sources and limits of knowledge. It asks what counts as knowledge, how claims can be justified and who is entitled to make them.

1. What it is

Epistemology is the branch of philosophy concerned with the nature, sources and limits of knowledge. It asks what counts as knowledge, how claims can be justified and who is entitled to make them. Ontology is the related study of what exists, or the nature of reality itself. Together they form the philosophical assumptions that sit beneath every research design and every practice theory (Crotty, 1998). Epistemology is a philosophical foundation and does not offer a substantive theory of human behaviour. It matters to social work because it shapes how workers judge evidence, weigh competing accounts of a situation and decide whose knowledge counts (Payne, 2021). Four broad positions dominate debate in the social sciences.

Positivism. Positivism holds that valid knowledge comes from systematic observation and that the methods of the natural sciences should be applied to social life. Auguste Comte (1830–1842/1975) argued that human thought develops through theological and metaphysical stages towards a “positive” or scientific stage, in which observable regularities replace speculation. Positivism assumes a single external reality that can be measured objectively, with the researcher separate from what is studied (Guba & Lincoln, 1994).

Logical positivism. The logical positivists of the Vienna Circle in the 1920s and 1930s sharpened this position through the verification principle. A statement was meaningful only if it could be verified by observation or was true by definition (Ayer, 1936). Statements about values, ethics or metaphysics were treated as expressions of feeling without factual content.

Postpositivism. Postpositivism accepts that a real world exists but holds that it can be known only imperfectly and probabilistically. Popper (1959) argued that scientific claims can never be conclusively verified; they can only be tested and potentially falsified. Postpositivists also accept that observation is shaped by theory and by the observer, so objectivity becomes a regulative ideal pursued through critical scrutiny, replication and the community of researchers (Phillips & Burbules, 2000).

Interpretivism (Max Weber’s Verstehen). Interpretivism holds that human action differs from natural events because it is meaningful to those who perform it. Social science must therefore understand the subjective meanings that actors attach to their conduct. Weber (1922/1978) called this interpretive understanding Verstehen and defined sociology as the science that seeks to understand social action and thereby explain its causes and effects. Interpretivism generally assumes multiple, socially situated realities and favours qualitative methods such as interviews and observation (Crotty, 1998).

Critical realism (Roy Bhaskar). Critical realism combines a realist ontology with a fallibilist epistemology. Bhaskar (1975) distinguished three domains of reality: the real (underlying structures and causal mechanisms), the actual (events that occur when mechanisms are activated) and the empirical (events that are experienced or observed). Mechanisms may exist without producing observable events, because their effects depend on context. Critical realism therefore rejects the positivist equation of reality with observation while also rejecting the view that reality is only what people construct (Houston, 2001).

Pragmatism (Peirce, James, Dewey). Pragmatism judges ideas by their practical consequences. Peirce (1878) proposed that the meaning of a concept lies in its conceivable practical effects. James (1907) extended this into a theory of truth: an idea is true insofar as it works reliably in experience. Dewey (1938) treated inquiry as a problem-solving process that begins with a troubling situation and ends when the situation is transformed. In contemporary research, pragmatism supports mixed-methods designs that select methods according to the question being asked (Morgan, 2014).

2. Historical development

Epistemological debate originates in philosophy, but the positions above took their modern form during nineteenth and twentieth century arguments about whether the social sciences should model themselves on physics. Positivism and interpretivism became rival paradigms, and the “paradigm wars” of the 1980s and 1990s set quantitative and qualitative research against each other (Guba & Lincoln, 1994). Critical realism and pragmatism developed partly as attempts to move beyond that opposition.

Social work has drawn on each position at different times. Early twentieth century casework sought scientific status through observation and classification. From the 1970s, interpretive and critical scholars questioned whether objective measurement could capture meaning, power and lived experience (Payne, 2021). More recently, Houston (2001) proposed critical realism as a basis for social work because it takes both structural causes and personal meaning seriously, and pragmatism informs much mixed-methods evaluation of social programs.

3. Practical guidance

Epistemology can seem abstract, but it shapes everyday practice decisions.

• Identify the knowledge claims in a case. Ask what kind of knowledge supports an assessment: measured risk factors, the client’s account, professional observation or agency policy. Each rests on different assumptions about what counts as valid knowledge.
• Match evidence to the question. Questions about whether an intervention reduces harm suit experimental or quasi-experimental evidence. Questions about how people experience a service suit interpretive methods (Crotty, 1998).
• Hold findings tentatively. Postpositivist and critical realist positions remind workers that knowledge is fallible. Treat assessments as working hypotheses open to revision as new information emerges (Popper, 1959).
• Look for underlying mechanisms. A critical realist approach asks what structures and mechanisms produce a problem in a given context. Housing insecurity, for example, may operate through different mechanisms for a young care leaver and an older woman after divorce (Houston, 2001).
• Take meaning seriously. Interpretive understanding requires workers to learn how clients themselves make sense of their situation before judging it.
• Use practical consequences as a test. A pragmatic approach asks what difference a way of understanding a situation makes to the client’s outcomes (Dewey, 1938).
• Recognise other knowledge systems. Aboriginal and Torres Strait Islander knowledges rest on relational ontologies and epistemologies that may not fit any of the four Western positions. Workers should not force them into those categories.

4. Critical evaluation

Strengths. Epistemology gives social workers a vocabulary for examining the assumptions behind research, policy and practice. It helps workers recognise that disagreements about evidence often reflect deeper disagreements about reality and knowledge (Crotty, 1998). Critical realism and pragmatism, in particular, offer social work a way to integrate structural analysis, measurement and personal meaning within one framework.

Limitations. Philosophical debates can become remote from practice, and the labels are often used loosely. Positivism is frequently presented as a caricature, which can lead social workers to dismiss quantitative evidence that could benefit clients. Interpretivism, in turn, has been criticised for neglecting structural constraints that people may not recognise in their own accounts (Houston, 2001). All four positions emerged from European and North American philosophy and may not represent Indigenous or non-Western ways of knowing.

Overall importance. Every social work theory and research method carries epistemological assumptions, whether or not they are stated. Understanding these positions allows workers to read research critically, combine forms of knowledge with care and explain the basis of their professional judgements. For this reason epistemology underpins the remaining entries in this family, especially evidence-informed practice (G7).

5. References

• Ayer, A. J. (1936). Language, truth and logic. Gollancz.
• Bhaskar, R. (1975). A realist theory of science. Leeds Books.
• Comte, A. (1975). Auguste Comte and positivism: The essential writings (G. Lenzer, Ed.). Harper & Row. (Original work published 1830–1842)
• Crotty, M. (1998). The foundations of social research: Meaning and perspective in the research process. Allen & Unwin.
• Dewey, J. (1938). Logic: The theory of inquiry. Henry Holt.
• Guba, E. G., & Lincoln, Y. S. (1994). Competing paradigms in qualitative research. In N. K. Denzin & Y. S. Lincoln (Eds.), Handbook of qualitative research (pp. 105–117). Sage.
• Houston, S. (2001). Beyond social constructionism: Critical realism and social work. British Journal of Social Work, 31(6), 845–861. https://doi.org/10.1093/bjsw/31.6.845
• James, W. (1907). Pragmatism: A new name for some old ways of thinking. Longmans, Green.
• Morgan, D. L. (2014). Pragmatism as a paradigm for social research. Qualitative Inquiry, 20(8), 1045–1053. https://doi.org/10.1177/1077800413513733
• Payne, M. (2021). Modern social work theory (5th ed.). Red Globe Press.
• Peirce, C. S. (1878). How to make our ideas clear. Popular Science Monthly, 12, 286–302.
• Phillips, D. C., & Burbules, N. C. (2000). Postpositivism and educational research. Rowman & Littlefield.
• Popper, K. R. (1959). The logic of scientific discovery. Hutchinson.
• Weber, M. (1978). Economy and society: An outline of interpretive sociology (G. Roth & C. Wittich, Eds.). University of California Press. (Original work published 1922)