Here’s an interesting paper (Greenland & Moore, 2021) that used our (Fugard & Potts, 2015) quantitative model for choosing a sample size for a thematic analysis. The authors also had a probability sample – very rare to see in published qualitative research.
Key ingredients: they had a sample frame (students who dropped out of open online university courses and their phone numbers); they wanted a comprehensive typology of reasons for drop out and suggestions for retaining students; and they could complete each interview within an average of 15 minutes (emphasis on average: some must have been longer).
Here are the authors’ conclusions:
“This study’s research design demonstrates the value of using a larger qualitative probability-based sample, in conjunction with in-depth interviewer probing and thematic analysis to investigate non-traditional student dropouts. While prior qualitative research has often used smaller samples (Creswell, 2007), recent studies have highlighted the need for more rigorous sample design to enable subthemes within themes, which is the key purpose of thematic analysis (eg, Nowell et al., 2017). This study’s sample moved beyond simple thematic saturation rationale, with consideration of the level of granularity required (Vasileiou et al., 2018). That is, 226 participants had a 99% probability of capturing all relevant dropout reason subthemes, down to a 5% incidence level or frequency of occurrence (Fugard & Potts, 2015). This study therefore presents a definitive typology of non-traditional student dropout in open online education.”
It’s exciting to see a rigorous and yet pragmatic qualitative study.
Realist evaluation (formerly known as realistic evaluation; Pawson & Tilley, 2004, p. 3) is an approach to theory-based evaluation that treats, e.g., burglars and prisons as real as opposed to narrative constructs (that seems uncontroversial); follows “a realist methodology” that aims for scientific “detachment” and “objectivity”; and also strives to be realistic about the scope of evaluation (Pawson & Tilley, 1997, pp. xii-xiv).
“Realist(ic)” evaluation proposes something apparently new and distinctive. But how does it look in reality? What’s new about it? Let’s have a read of Pawson and Tilley’s (1997) classic to try to find out.
Open any text on social science methodology, and it will say something like the following about the process of carrying out research:
Review what is known about your topic area, including theories which attempt to explain and bring order to the various disparate findings.
Use prior theory, supplemented with your own thinking, to formulate research questions or hypotheses.
Choose methods that will enable you to answer those questions or test the hypotheses.
Gather and analyse data.
Interpret the analysis in relation to the theories introduced at the outset. What have you learned? Do the theories need to be tweaked? For qualitative research, this interpretation and analysis are often interwoven.
Acknowledge limitations of your study. This will likely include reflection about whether your method or the theory are to blame for any mismatch between theory and findings.
Add your findings to the pool of knowledge (after a gauntlet of peer review).
Loop back to 1.
Realist evaluation has similar:
It is scientific method as usual with constraints on what the various stages should include for a study to be certified genuinely “realist”. For instance, the theories should be framed in terms of contexts, mechanisms, and outcomes (more on which in a moment); hypotheses emphasise the “for whom” and circumstances of an evaluation; and instead of “empirical generalisation” there is a “program specification”.
The method of data collection and analysis can be anything that satisfies this broad research loop (p. 85):
“… we cast ourselves as solid members of the modern, vociferous majority […], for we are whole-heartedly pluralists when it comes to the choice of method. Thus, as we shall attempt to illustrate in the examples to follow, it is quite possible to carry out realistic evaluation using: strategies, quantitative and qualitative; timescales, contemporaneous or historical; viewpoints, cross-sectional or longitudinal; samples, large or small; goals, action-oriented or audit-centred; and so on and so forth. [… T]he choice of method has to be carefully tailored to the exact form of hypotheses developed earlier in the cycle.”
This is reassuringly similar to the standard textbook story. However, like the standard story, in practice there are ethical and financial constraints on method meaning that the ideal approach to answer a question may not be feasible, and yet an evaluation of some description is deemed necessary nonetheless. Indeed the UK government’s evaluation bible, the Magenta Book (HM Treasury, 2020), recommends using what it calls “theory-based” approaches like “realist” evaluation when experimental and quasi-experimental approaches are not feasible. (See also, What is Theory-Based Evaluation, really?)
More than a moment’s thought about theory
Pawson and Tilley (1997) emphasise the importance of thinking about why social interventions may lead to change and not only looking at outcomes, which they illustrate with the example of CCTV:
“CCTV certainly does not create a physical barrier making cars impenetrable. A moment’s thought has us realize, therefore, that the cameras must work by instigating a chain of reasoning and reaction. Realist evaluation is all about turning this moment’s thought into a comprehensive theory of the mechanisms through which CCTV may enter the potential criminal’s mind, and the contexts needed if these powers are to be realized.” (p. 78)
They then list a range of potential mechanisms. CCTV might make it more likely that thieves are caught in the act. Or maybe the presence of CCTV make car parks feel safer, which means they are used by more people whose presence and watchful eyes prevent theft. So other people provide the surveillance rather than the camera bolted to the wall.
Nothing new here – social science is awash with theory (Pawson and Tilley cite Durkheim’s 1950s work on suicide as an example). Psychological therapies are some of the most evaluated of social interventions and the field is particularly productive when it comes to theory; see, e.g., Whittle (1999, p. 240) on psychoanalysis, a predecessor of modern therapies:
“Psychoanalysis is full of theory. It has to be, because it is so distrustful of the surface. It could still choose to use the minimum necessary, but it does the opposite. It effervesces with theory…”
To take a more contemporary example, Power (2010) argues that effects in modern therapies involve at least one of the following three activities: exploring and using how the relationship between therapist and client mirrors relationships outside therapy (transference); graded exposure to situations which provoke anxiety; and challenging dysfunctional assumptions about how the social world works. For each of these activities there are detailed theories of change.
However, perhaps evaluations of social programmes – therapies included – have concentrated too much on tracking outcomes and neglected getting to grips with testing potential mechanisms of change, so “realist” evaluation is potentially a helpful intervention. The specific example of CCTV is a joy to read and is a great way to bring the sometimes abstract notion of social mechanism alive.
The structure of explanations in “realist” evaluation
The context-mechanism-outcome triad is a salient feature of the approach. Rather than define each of these (see the original text), here are four examples from Pawson and Tilley (1997) to illustrate what they are. The middle column (New mechanism) describes the putative mechanism that may be “triggered” by a social programme that has been introduced.
Poor-quality, hard-to-let housing; traditional housing department; lack of tenant involvement in estate management
Improved housing and increased involvement in management create increased commitment to the estate, more stability, and opportunities and motivation for social control and collective responsibility
Three tower blocks, occupied mainly by the elderly; traditional housing department; lack of tenant involvement in estate management
Concentration of elderly tenants into smaller blocks and natural wastage creates vacancies taken up by young, formerly homeless single people inexperienced in independent living. They become the dominant group. They have little capacity or inclination for informal social control, and are attracted to a hospitable estate subterranean subculture
Increased burglary prevalence concentrated amongst the more
vulnerable; high levels of vandalism and incivility
Prisoners with little or no previous education with a growing string of convictions – representing a ‘disadvantaged’ background
Modest levels of engagement and success with the program trigger ‘habilitation’ process in which the inmate experiences self-realization and social acceptability (for the first time)
Lowest levels of reconviction as compared with statistical norm for such inmates
High numbers of prepayment meters, with a high proportion of burglaries involving cash from meters
Removal of cash meters reduces incentive to burgle by decreasing actual or perceived rewards
Reduction in percentage of burglaries involving meter breakage; reduced risk of burglary at dwellings where meters are removed; reduced burglary rate overall
This seems a helpful way to organise thinking about the context-mechanism-outcome triad, irrespective of whether the approach is labelled “realist”.
The authors emphasise that the underlying causal model is “generative” in the sense that causation is seen as
“acting internally as well as externally. Cause describes the transformative potential of phenomena. One happening may well trigger another but only if it is in the right condition in the right circumstances. Unless explanation penetrates to these real underlying levels, it is deemed to be incomplete.” (p. 34)
The “internal” here appears to refer to looking inside the “black box” of a social programme to see how it operates, rather than merely treating it as something that is present in some places and absent in others. Later, there is further elaboration of what “generative” might mean:
“To ‘generate’ is to ‘make up’, to ‘manufacture’, to ‘produce’, to ‘form’, to ‘constitute’. Thus when we explain a regularity generatively, we are not coming up with variables or correlates which associate one with the other; rather we are trying to explain how the association itself comes about. The generative mechanisms thus actually constitute the regularity; they are the regularity.” (p. 67)
We also learn that an action is causal only if its outcome is triggered by a mechanism in a context (p. 58). Okay, but how do we find out if an action’s outcome is triggered in this manner? “Realist” evaluation does not, in my view, provide an adequate analysis of what a causal effect is. Understandable, perhaps, given its pluralist approach to method. So, understandings of causation must come from elsewhere.
Mechanisms can be seen as “entities and activities organized in such a way that they are responsible for the phenomenon” (Illari & Williamson, 2011, p. 120). In “realist” evaluation, entities and their activities in the context would be included in this organisation too – the context supplies the mechanism on which a programme intervenes. So, let’s take one of the example mechanisms from the table above:
“Improved housing and increased involvement in management create increased commitment to the estate, more stability, and opportunities and motivation for social control and collective responsibility.”
To make sense of this, we need a theory of what improved housing looks like, what involvement in management and commitment to the estate, etc., means. To “create commitment” seems like a psychological, motivational process. The entities are the housing, management structures, people living in the estate, etc. To evidence the mechanism, I think it does help to think of variables to operationalise what might be going on and to use comparison groups to avoid mistaking, e.g., regression to the mean or friendlier neighbours for change due to improved housing. And indeed, Pawson and Tilley use quantitative data in one of the “realist” evaluations they discuss (next section). Such operationalisation does not reduce a mechanism to a set of variables; it is merely a way to analyse a mechanism.
Kinds of evidence
Chapter 4 gives a range of examples of the evidence that has been used in early “realist” evaluations. In summary, and confirming the pluralist stance mentioned above, it seems that all methods are relevant to realist evaluation. Two examples:
Interviews with practitioners to try to understand what it is about a programme that might effect change: “These inquiries released a flood of anecdotes, and the tales from the classroom are remarkable not only for their insight but in terms of the explanatory form which is employed. These ‘folk’ theories turn out to be ‘realist’ theories and invariably identify those contexts and mechanisms which are conducive to the outcome of rehabilitation.” (pp. 107-108)
Identifying variables in an information management system to “operationalize these hunches and hypotheses in order to identify, with more precision, those combinations of types of offender and types of course involvement which mark the best chances of rehabilitation. Over 50 variables were created…” (p. 108)
Some researchers have made a case for and carried out what they term realist randomised controlled trials (Bonell et al., 2012; which seems eminently sensible to me). The literature subsequently exploded in response. Here’s an illustrative excerpt of the criticisms (Marchal et al., 2013, p. 125):
“Experimental designs, especially RCTs, consider human desires, motives and behaviour as things that need to be controlled for (Fulop et al., 2001, Pawson, 2006). Furthermore, its analytical techniques, like linear regression, typically attempt to isolate the effect of each variable on the outcome. To do this, linear regression holds all other variables constant “instead of showing how the variables combine to create outcomes” (Fiss, 2007, p. 1182). Such designs “purport to control an infinite number of rival hypotheses without specifying what any of them are” by rendering them implausible through statistics (Campbell, 2009), and do not provide a means to examine causal mechanisms (Mingers, 2000).”
Well. What to make of this. Yes, RCTs control for stuff that’s not measured and maybe even unmeasurable. But you can also measure stuff you know about and see if that moderates or mediates the outcome (see, e.g., Windgassen et al., 2016). You might use the numbers to select people for qualitative interview to try to learn more about what is going on. It is also trivial to calculate marginal outcome predictions for combinations of predictors together, rather than merely identifying which predictors are likely non-zero when holding others fixed. See Bonell et al. (2016) for a patient reply.
The plea for evaluators to spend more time developing theory is welcome – especially in policy areas where “key performance indicators” and little else are the norm (see also Carter, 1989, on KPIs as dials versus tin openers opening a can of worms). It is a laudable aim to help “develop the theories of practitioners, participants and policy makers” of why a programme might work (Pawson & Tilley, 1997, p. 214). The separation of context, mechanism, and outcome, also helps structure thinking about social programmes (though there is widespread confusion about what a mechanism is in the “realist” literature; Lemire et al., 2020). But “realist” evaluation is arguably better seen as an exposition of a particular reading of traditional scientific method applied to evaluation, with a call for pluralist methods. I am unconvinced that it is a novel form of evaluation.
“… tensions between quantitative and qualitative methods can reflect more on academic politics than on epistemology. Qualitative approaches are generally associated with an interpretivist position, and quantitative approaches with a positivist one, but the methods are not uniquely tied to the epistemologies. An interpretivist need not eschew all numbers, and positivists can and do carry out qualitative studies (Lin, 1998). ‘Quantitative’ need not mean ‘objective’. Subjective approaches to statistics, for instance Bayesian approaches, assume that probabilities are mental constructions and do not exist independently of minds (De Finetti, 1989). Statistical models are seen as inhabiting a theoretical world which is separate to the ‘real’ world though related to it in some way (Kass, 2011). Physics, often seen as the shining beacon of quantitative science, has important examples of qualitative demonstrations in its history that were crucial to the development of theory (Kuhn, 1961).”
Note. This is quite a ranty blog post – especially the first two paragraphs. Readers may therefore wish to read it in the voice of Bernard Black from the series Black Books to make it more palatable. You may also be interested in our short BMJ comment.
Many of the social science papers I read have long jargon-heavy sections justifying the methodology used. This is particularly common in writeups of qualitative studies, though not unheard of in quantitative work. There are reflections on epistemology and ontology – sometimes these must be discussed by doctoral students if they are to acquire a degree.
There is discussion of social constructionism, critical realism, phenomenology, interpretation, intersubjectivity, hermeneutics. “But what is reality, really?” the authors ponder; “What can we know?” Quantitative analysis is “positivist” and to find or construct meaning you need a qualitative analysis (it is claimed).
Although I love philosophy, most of this reflection bores me to tears and seems irrelevant.
I think many differences between methods are exaggerated, clever-sounding –isms are fetishised, grandiose meta-theories concerning the nature of reality are used to explain away straightforward study limitations such as poor sampling. I bet some researchers feel they have to reel off fancy terminology to play the academic game, even though they think it’s bollocks.
But there are different kinds of research in the social sciences, beyond the dreary qual versus quant distinction as usually discussed. Might it be easiest to see the differences in terms of the goals of the research? Here are three examples of goals, to try to explain what I mean.
Evoke empathy. If you can’t have a chat with someone then the next best way to empathise with them is via a rich description by or about them. There is a bucket-load of pretentiousness in the literature (search for “thick description” to find some). But skip over this and there are wonderful works which are simply stories. I love stories. Biographies you read which make you long to meet the subject are prime examples. Film documentaries, though not fitting easily into traditional research output, are another. Anthologies capturing concise, emotive expressions of people’s lived experience. “Interpretative Phenomenological Analyses” manage to include stories too, though you might have to wade through nonsense to get to them.
Classify. This may be the classification of perspectives, attitudes, experiences, processes, organisations, or other stuff-that-happens in society. For example: social class, personality, goals people have in psychological therapy, political orientation, mental health problem, emotional experiences. The goal here is to impose structure on material, reveal patterns, whether it be interview responses, answers on Likert scales, or some other kind of observation. There’s no escaping theory, articulated and debated or unarticulated and unchallenged, when doing this. There may be a hierarchical structure to classifications. There may be categorical or dimensional judgments (or both, where the former is derived from a threshold on the latter), e.g., consider Myers-Briggs or the Big Five personality types. Dimensions are quantitative things, but there are qualitative differences between them.
Predict. Finally you often want to make predictions. Do people occupying a particular social class location tend to experience some mental health difficulties more often than others? Does your personality predict the kinds of books you like to read. Do particular events predict an emotion you will feel? Other predictions concern the impact of interventions of various kinds (broadly construed). What would happen if you voted Green and told your friends you were going to do so? What would happen if you funded country-wide access to cognitive behavioural therapy rather than psychoanalysis? Theory matters here too, usually involving a story or model of why variables relate to each other.
These distinctions cannot be straightforwardly mapped onto quantitative and qualitative analysis. As we wrote in 2016:
“Some qualitative research develops what looks like a taxonomy of experiences or phenomena. Much of this isn’t even framed as qualitative. Take for example Gray’s highly-cited work classifying type 1 and type 2 synapses. His labelled photos of cortex slices illustrate beautifully the role of subjectivity in qualitative analysis and there are clear questions about generalisability. Some qualitative analyses use statistical models of quantitative data, for example latent class analyses showing the different patterns of change in psychological therapies.”
People often try to make predictions without using a quantitative model. Others use quantitative approaches to develop qualitatively different groups. Cartoonish characterisations of the different approaches to doing social (and natural) science research stifle creativity and misrepresent how the research is and could actually be done.
You’ll be aware of the gist. Quantitative statistical models are great for generalizing, also data suitable for the stats tends to be quicker to analyze than qualitative data. More qualitative methods, such as interviewing, tend to provide much richer information, but generalization is very tricky and often involves coding up so the data can be fitted using the stats. How else can the two (crudely defined here!) approaches to analysis talk to each other?
I like this a lot:
“In the social sciences we are often criticized by the ethnographers and the anthropologists who say that we do not link in with them sufficiently and that we simply produce a set of statistics which do not represent reality.”
“… by using league tables, we can find examples of places which are perhaps not outliers but where we want to look for the pathways of influence on why they are not outliers. For example, one particular Bangladeshi village would have been expected to have high levels of immunization, whereas it was down in the middle of the table with quite a large confidence interval. This seemed rather strange, but our colleagues were able to attribute this to a fundamentalist imam. […] Another example is a village at the top of the league table, which our colleagues could attribute to a very enthusiastic school-teacher.”
“… by connecting with the qualitative workers, by encouraging the fieldworkers to look further at particular villages and by saying to them that we were surprised that this place was good and that one was bad, we could get people to understand the potential for linking the sophisticated statistical methods with qualitative research.” (Ian Diamond and Fiona Steele, from a comment on a paper by Goldstein and Spiegelhalter, 1996, p. 429)
Also reminds me of a study by Turner and Sobolewska (2009) which split participants on their Systemizing and Empathizing Quotient scores. Participants were asked, “What is inside a mobile phone?” Here’s what someone with high EQ said:
“It flashes the lights, screen flashes, and the buttons lights up, and it vibrates. It comes to life on the inside and it comes to life on the outside, and you talk to the one side and someone is answering on the other side”
And someone with high SQ:
“Many things, circuit boards, chips, transceiver [laughs], battery [pause], a camera in some of them, a media player, buttons, lots of different things. [pause] Well there are lots and lots of different bits and pieces to the phone, there are mainly in … Eh, like inside the chip there are lots of little transistors, which is used, they build up to lots of different types of gates…”
(One possible criticism is that the SQ/EQ just found students of technical versus non-technical subjects… But the general idea is still lovely.)
Would be great to see more quantitative papers with little excerpts of stories. We tried in our paper on spontaneous shifts of interpretation on a probabilistic reasoning task (Fugard, Pfeifer, Mayerhofer & Kleiter, 2011, p. 642), but we only squeezed in a few sentences:
‘Participant 34 (who settled into a conjunction interpretation) said: “I only looked at the shape and the color, and then always out of 6; this was the quickest way.” Participant 37, who shifted from the conjunction to the conditional event, said: “In the beginning [I] always [responded] ‘out of 6,’ but then somewhere in the middle . . . Ah! It clicked and I got it. I was angry with myself that I was so stupid before.” Five participants spontaneously reported when they shifted during the task, for example, saying, “Ah, this is how it works.”’
Fugard, A. J. B., Pfeifer, N., Mayerhofer, B., & Kleiter, G. D. (2011). How people interpret conditionals: Shifts towards the conditional event. Journal of Experimental Psychology: Learning, Memory, and Cognition, 37, 635–648.
Goldstein, H. & Spiegelhalter, D. J. (1996). League tables and their limitations: statistical issues in comparisons of institutional performance. Journal of the Royal Statistical Society. Series A (Statistics in Society)159, 385–443.
Turner, P. & Sobolewska, E. (2009). Mental models, magical thinking, and individual differences. Human Technology5, 90–113.