Attitude-behavior consistency is when a person's attitude is consistent with their behavior. This is not true in many cases. The fact that people often express attitudes that are inconsistent with how they act may surprise those unfamiliar with social and behavioral science, but it is an important fact to understand because facts are often reported as if they are about people's actions when they may only be known to be true about their words. It is often much easier to conduct interviews or surveys than to obtain records of how people behave in situations. Sometimes attitudes, such as voting, are measurably consistent with behavior. In such cases it may be possible to obtain accurate estimates of behavior. However, there is no general method for correcting for attitude-behavior inconsistency.
Attitude-behavior consistency is an important concept for social science research because claims are often made about behavior based on evidence which is really about attitudes. The attitudinal fallacy is committed answer when verbal data, like are used to support claims not about what people believe or say, but what they do. Data collection methods based on self-report like surveys, and interviews are vulnerable to the attitudinal fallacy if they attempt to measure behavior and reported attitudes are inconsistent with the behavior.
Research methods that directly observe behaviors avoid the attitudinal fallacy as a matter of course. However many kinds of behavior are not easily observed. Ethnography can make rich observations and descriptions of behavior and allow for comparison between behavior and attitude. Unfortunately, in general ethnographic data cannot be used to draw statistically generalizable conclusions about behavior in a population.Ethnographers can still commit the attitudinal fallacy if they rely on quotations as evidence for behaviors.Experiments in laboratories make it possible to observe behavior, with the limitations that come from the laboratory situation. Internet research makes it possible to study a wide array of behaviors that leave traces online. Data from the Internet of things and sensors that record behavior like from location tracking may make it possible to measure more kinds of behavior that avoids the attitudinal fallacy. It may not be possible to study some kinds of behavior other than through interviews or surveys. While the knowledge produced in such cases may be useful. The possibility of inconsistency between behavior and reported attitudes is always a concern.