Manifest and latent functions and dysfunctions
Manifest and latent functions are social scientific concepts first clarified for sociology by Robert K. Merton. Merton appeared interested in sharpening the conceptual tools to be employed in a functional analysis.
Manifest functions are conscious, deliberate and beneficial, the latent ones the unconscious, unintended and beneficial, and dysfunctions are unconscious, unintended and harmful.  While functions are intended (manifest) or unintended (latent), and have a positive effect on society, dysfunctions are unintended or unrecognized (latent) and have a negative effect on society.[clarification needed]
Manifest functions are the consequences that people observe or expect. It is explicitly stated and understood by the participants in the relevant action. The manifest function of a rain dance, used as an example by Merton in his 1967 Social Theory and Social Structure, is to produce rain, and this outcome is intended and desired by people participating in the ritual.
Latent functions are those that are neither recognized nor intended. A latent function of a behavior is not explicitly stated, recognized, or intended by the people involved. Thus, they are identified observers. In the example of rain ceremony, the latent function reinforces the group identity by providing a regular opportunity for the members of a group to meet and engage in a common activity.
Peter L. Berger describes a series of examples illustrating the differences between manifest functions and latent dysfunctions:
|“||"...the “manifest” function of antigambling legislation may be to suppress gambling, its “latent” function to create an illegal empire for the gambling syndicates. Or Christian missions in parts of Africa “manifestly” tried to convert Africans to Christianity, “latently” helped to destroy the indigenous tribal cultures and this provided an important impetus towards rapid social transformation. Or the control of the Communist Party over all sectors of social life in Russia “manifestly” was to assure the continued dominance of the revolutionary ethos, “latently” created a new class of comfortable bureaucrats uncannily bourgeois in its aspirations and increasingly disinclined toward the self-denial of Bolshevik dedication (nomenklatura). Or the “manifest” function of many voluntary associations in America is sociability and public service, the “latent” function to attach status indices to those permitted to belong to such associations.” "||”|
While Talcott Parsons tends to emphasize the manifest functions of social behavior, Merton sees attention to latent functions as increasing the understanding of society: the distinction between manifest and latent forces the sociologist to go beyond the reasons individuals give for their actions or for the existence of customs and institutions; it makes them look for other social consequences that allow these practices’ survival and illuminate the way society works.
Dysfunctions can also be manifest or latent. While functions are intended or recognized (manifest), and may have a positive effect on society, dysfunctions are unintended or unrecognized (latent) and have a negative effect on society.
Manifest dysfunctions are anticipated disruptions of social life. For example, a manifest dysfunction of a festival might include disruptions of transportation and excessive production of garbage. Latent dysfunctions are unintended and unanticipated disruptions of order and stability. In the festival example, they would be represented by people missing work due to the traffic jam.
Medical science model
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Broadly stated and here relying on the systems model first developed in medical science, an interrelated bundle of social structures (e.g., Zulu culture), treated as a social system, involves the parts (structural elements) acting in such a fashion so as to help maintain the homeodynamic equilibrium of the system of which they are an element. Manifest functions are the obvious and intended consequences a structural feature displays in the maintenance of the steady state of the system of which it is a part. Latent functions are less obvious or unintended consequences. Both manifest and latent functions contribute to the social system’s unchanging ongoingness or stasis. In this very specific sense both may be interpreted as useful and positive.
In conducting a functional analysis, dysfunctions are consequences of structural elements that produce changes in their environing social system. The flame of the candle system flickers. The structural cause would be labeled dysfunctional. The candle’s steady state has been disturbed or changed. The concept affords the only relief to structural-functionalism’s inherent conservative bias. Dysfunction signifies the mechanism by which social change is evidenced within a social system. Whether that change is manifest or latent is a relatively simple empirical question. Whether that change is good or bad would seem to require interpretative criteria not afforded by a social scientific paradigm for functional analysis.
- "... the distinction between manifest and latent functions was devised to preclude ... confusion ... between conscious motivations for social behaviour and its objective consequences" - Robert K. Merton, Social Theory and Social Structure, 1957, page 61 
- "... I have adapted the terms "manifest" and "latent" from their use in another context by Freud...", .
- "Emile Durkheim's... analysis of the social functions of punishment is... focused on its latent functions (consequences for the community) rather than confined to manifest functions (consequences for the criminal)", ibid.
- MANIFEST AND LATENT FUNCTIONS Extract from Robert K. Merton, Social Theory and Social Structure. Glencoe, IL: Free Press, 1957, pp. 60 – 69.
- MANIFEST/LATENT FUNCTION, definition at Principia Cybernetica Web
- ANTHROPOLOGICAL THEORIES: A GUIDE PREPARED BY STUDENTS FOR STUDENTS Dr. M.D. Murphy
- THE UNANTICIPATED CONSEQUENCES OF HUMAN ACTION: A Synoposis of the Structure-Functional Theories of Robert K. Merton, Diligio, 2000
- Merton, Robert K. 1957. Social Theory and Social Structure, revised and enlarged edition. New York: Free Press of Glencoe. Excerpts, selected by Frank Elwell
- Manifest and Latent Functions Excerpt from Invitation to Sociology by Peter L. Berger, pp. 40–41 (NY: Doubleday (Anchor Books), 1963)
- David B. Brinkerhoff, Suzanne T. Ortega, Rose Weitz, Thomson Wadsworth, 2004, ISBN 0-534-62676-9,  Google Print, p. 12]
- Joan Ferrante, Sociology: A Global Perspective, Thomson Wadsworth, 2005, ISBN 0-495-00561-4, Google Print, p.37
- Paul Helm, Manifest and Latent Functions, The Philosophical Quarterly, Vol. 21, No. 82 (Jan., 1971), pp. 51–60, JSTOR