Compare methods

	Bystander Intervention Paradigm	Asch Conformity Paradigm	Confederate Paradigm	Cover Story Deception
Field	Social Psychology	Social Psychology	Social Psychology	Social Psychology
Family	Process / pipeline	Process / pipeline	Process / pipeline	Process / pipeline
Year of origin	1968	1956	1956	1959
Originator	Bibb Latane & John Darley	Solomon Asch	Classic social psychology (Asch, Milgram, Latane and others)	Classic experimental social psychology
Type	Experimental paradigm for emergency helping	Experimental paradigm for normative social influence	Methodological design using trained accomplices	Methodological design controlling participant expectations
Seminal source	Latane, B., & Darley, J. M. (1968). Group inhibition of bystander intervention in emergencies. Journal of Personality and Social Psychology, 10(3), 215-221.	Asch, S. E. (1956). Studies of independence and conformity: I. A minority of one against a unanimous majority. Psychological Monographs: General and Applied, 70(9), 1-70.	Asch, S. E. (1956). Studies of independence and conformity: I. A minority of one against a unanimous majority. Psychological Monographs: General and Applied, 70(9), 1-70.	Festinger, L., & Carlsmith, J. M. (1959). Cognitive consequences of forced compliance. Journal of Abnormal and Social Psychology, 58(2), 203-210.
Aliases	Bystander Effect Experiment, Diffusion of Responsibility Paradigm, Emergency Helping Paradigm	Asch Line Experiment, Conformity Paradigm, Majority Influence Task	Experimental Accomplice Method, Stooge Paradigm, Trained Confederate Design	Deception Design, Cover Story Method, Experimental Deception
Related	3	3	3	3
Summary	The bystander intervention paradigm, pioneered by Latane and Darley in 1968, experimentally demonstrates the bystander effect: the counterintuitive finding that individuals are less likely to help in an emergency when other people are present. In their classic studies a participant encounters a staged emergency -- smoke filling a room, a person apparently having a seizure, or a fall -- either alone or in the company of others (sometimes passive confederates). The dependent measures are whether and how quickly the participant intervenes. Helping reliably declines, and slows, as the number of bystanders increases, an effect Latane and Darley explained through diffusion of responsibility, pluralistic ignorance, and audience inhibition. They formalized the path to helping as a sequence of decisions, each of which the presence of others can derail. The paradigm reshaped understanding of prosocial behavior and emergency response.	The Asch conformity paradigm, established by Solomon Asch in the 1950s, demonstrates the power of group pressure to make people publicly endorse a manifestly false judgment. A naive participant joins a group of confederates for a simple perceptual task -- matching the length of a standard line to one of three comparison lines, where the correct answer is obvious. On certain critical trials the confederates unanimously give the same wrong answer, and the experimenter measures how often the lone real participant goes along with the majority against the evidence of their own eyes. Asch found that a substantial proportion of participants conformed at least once, even on an unambiguous task, while systematic variations revealed that conformity rises with majority size up to a point and collapses when unanimity is broken. The paradigm became the canonical demonstration of normative social influence.	The confederate paradigm is a foundational methodological design in social psychology in which trained accomplices -- people who appear to be ordinary participants or bystanders but are actually part of the research team -- enact scripted behavior to create controlled social situations. By standardizing what confederates do, researchers can manipulate the social environment with precision while keeping the naive participant convinced the situation is real. Confederates have been the linchpin of many landmark studies: the unanimous wrong majority in Asch's conformity work, the passive bystanders in Latane and Darley's helping experiments, the learner in Milgram's obedience studies, and partners in countless interaction studies. The paradigm allows experimental control over otherwise uncontrollable social stimuli, making it possible to draw causal conclusions about how others' behavior shapes our own.	Cover story and deception design is the methodological practice of concealing a study's true purpose behind a plausible false rationale so that participants behave spontaneously rather than in line with what they think the experimenter wants. Because people who guess a study's hypothesis may consciously or unconsciously alter their behavior -- the problem of demand characteristics -- social psychologists often present a cover story that misdirects attention, embed the real dependent measure within an apparently unrelated task, and, when necessary, use additional deceptions such as confederates or false feedback. This approach made possible many of the field's classic findings on conformity, obedience, helping, and dissonance, where awareness of the true question would have destroyed the phenomenon. Deception carries serious ethical obligations, requiring justification, minimization of harm, suspicion probing, and thorough debriefing, which contemporary practice and ethics codes strictly govern.