Statistical method for finding a line or curve—the line of best fit—that best represents a correspondence between two measured quantities (e.g., height and weight of a group of college students). When the measurements are plotted as points on a graph and seem to fall near the same line, the least squares method may be used to determine the best-fitting line. The method uses calculus techniques to find the minimum of the sum of the squares of the vertical distances of each data point from the proposed line. More generally, the process is called regression or, when the fitted curve is a line, linear regression.

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Influential system of dramatic training developed by the Russian actor, producer, and theoretician Konstantin Stanislavsky. The method was developed over years of trial and error, beginning circa 1898. It requires that an actor use his emotion memory (i.e., his recall of past experiences and emotions) to identify with the character's inner motivation. The technique was developed in reaction to the histrionic acting styles of the 19th century. Noted American practitioners began using the method in the 1920s; they have included Lee Strasberg, Marlon Brando, Dustin Hoffman, and Eli Wallach.

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In logic, the procedure by which an entire science or system of theorems is deduced in accordance with specified rules by logical deduction from certain basic propositions (axioms), which in turn are constructed from a few terms taken as primitive. These terms may be either arbitrarily defined or conceived according to a model in which some intuitive warrant for their truth is felt to exist. The oldest examples of axiomatized systems are Aristotle's syllogistic and Euclidean geometry. Early in the 20th century, Bertrand Russell and Alfred North Whitehead attempted to formalize all of mathematics in an axiomatic manner. Scholars have even subjected the empirical sciences to this method, as in J. H. Woodger's The Axiomatic Method in Biology (1937) and Clark Hull's Principles of Behavior (1943).

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