The principle of methodological individualism, which holds that social scientists should seek to understand collectivities (e.g. nations, cultures, governments, churches, corporations, etc.) solely as the result and the context of the actions of individual persons, can be traced to Weber, particularly to the first chapter of Economy and Society, in which he argues that only individuals "can be treated as agents in a course of subjectively understandable action".[28][26] In other words, Weber contended that social phenomena can be understood scientifically only to the extent that they are captured by models of the behaviour of purposeful individuals – models that Weber called "ideal types" – from which actual historical events necessarily deviate due to accidental and irrational factors.[28] The analytical constructs of an ideal type never exist in reality, but provide objective benchmarks against which real-life constructs can be measured:[29][30]