Lumpers and splitters  

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
demarcation problem

Lumping and splitting are opposing tendencies in any discipline which has to place individual examples into rigorously defined categories. The lumper/splitter problem occurs when there is the need to create classifications and assign examples to them, for example schools of literature, biological taxa and so on. A "lumper" is an individual who takes a gestalt view of a definition, and assigns examples broadly, assuming that differences are not as important as signature similarities. A "splitter" is an individual who takes precise definitions, and creates new categories to classify samples that differ in key ways.


Origin of the terms

The earliest use of these terms was apparently by Charles Darwin, in a letter to J. D. Hooker in 1857. "(Those who make many species are the 'splitters,' and those who make few are the 'lumpers.')" They were introduced more widely by the biologist George G. Simpson in his 1945 work "The Principles of Classification and a Classification of Mammals." As he put it, "splitters make very small units – their critics say that if they can tell two animals apart, they place them in different genera … and if they cannot tell them apart, they place them in different species. … Lumpers make large units – their critics say that if a carnivore is neither a dog nor a bear, they call it a cat."

Another early use can be found in the title of a 1969 paper by the medical geneticist, Victor McKusick: "On lumpers and splitters, or the nosology of genetic disease."

Reference to lumpers and splitters also appeared in a debate in 1975 between J. H. Hexter and Christopher Hill, in the Times Literary Supplement. It followed from Hexter's detailed review of Hill's book Change and Continuity in Seventeenth Century England, in which Hill developed Max Weber's argument that the rise of capitalism was facilitated by Calvinist Puritanism. Hexter objected to Hill's 'mining' of sources to find evidence that supported his theories. Hexter argued that Hill plucked quotations from sources in a way that distorted their meaning. Hexter explained this as a mental habit that he called 'lumping'. According to him, 'Lumpers' rejected differences and chose to emphasize similarities. Any evidence that did not fit their arguments was ignored as aberrant. 'Splitters', in contrast, emphasised differences, and resisted simple schemes. 'Lumpers' consistently tried to create coherent patterns. 'Splitters' preferred incoherent complexity. In a similar vein, historian of ideas Isaiah Berlin categorized thinkers as 'Hedgehogs' (lumpers) and 'Foxes' (splitters) in his essay on Leo Tolstoy, 'The Hedgehog and the Fox'.

Usage in various fields


biological classification

The categorization and naming of a particular species should be regarded as a hypothesis about the evolutionary relationships and distinguishability of that group of organisms. As further information comes to hand, the hypothesis may be confirmed or refuted. Sometimes, especially in the past when communication was more difficult, taxonomists working in isolation have given two distinct names to individual organisms later identified as the same species. When two named species are agreed to be of the same species, the older species name is almost always retained dropping the newer species name honoring a convention known as "priority of nomenclature". This form of lumping is technically called synonymization. Dividing a taxon into multiple, often new, taxa is called splitting. Taxonomists are often referred to as "lumpers" or "splitters" by their colleagues, depending on their personal approach to recognizing differences or commonalities between organisms.



In history, lumpers are those who tend to create broad definitions that cover large periods of time and many disciplines, whereas splitters want to assign names to tight groups of inter-relationships. Lumping tends to create a more and more unwieldy definition, with members having less and less mutually in common. This can lead to definitions which are little more than conventionalities, or groups which join fundamentally different examples. Splitting often leads to "distinctions without difference", ornate and fussy categories, and failure to see underlying similarities.

For example, in the arts, "Romantic" can refer specifically to a period of German poetry roughly from 1780–1810, but would exclude the later work of Goethe, among other writers. In music it can mean every composer from Hummel through Rachmaninoff, plus many that came after.

Language classification

language classification

There is no agreement among historical linguists about what amount of evidence is needed for two languages to be safely classified in the same language family. For this reason, many language families have had lumper–splitter controversies, including Altaic, Pama–Nyungan, Nilo-Saharan, and most of the larger families of the Americas. At a completely different level, the splitting of mutually intelligible dialect continuums into different languages, or lumping them into one, is also an issue that continually comes up, though the consensus in contemporary linguistics is that there is no completely objective way to settle the question.

Splitters regard the comparative method (meaning not comparison in general, but only reconstruction of a common ancestor or protolanguage) as the only valid proof of kinship, and consider genetic relatedness to be the question of interest. American linguists of recent decades tend to be splitters.

Lumpers are more willing to admit techniques like mass lexical comparison or lexicostatistics, and mass typological comparison, and to tolerate the uncertainty of whether relationships found by these methods are the result of linguistic divergence (descent from common ancestor) or language convergence (borrowing). Much long-range comparison work has been from Russian linguists like Vladislav Illich-Svitych and Sergei Starostin. In the US, Greenberg's and Ruhlen's work has been met with little acceptance from linguists. Earlier American linguists like Morris Swadesh and Edward Sapir also pursued large-scale classifications like Sapir's 1929 scheme for the Americas, accompanied by controversy similar to that today.

Wikipedia philosophies

Two of the many underlying philosophies of Wikipedia are mergism and separatism: the former defends that minor topics should be merged into the relevant main articles, while the latter advocates for splitting minor topics off into their own articles.

See also

Unless indicated otherwise, the text in this article is either based on Wikipedia article "Lumpers and splitters" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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