The Husserlian elucidation of lifeworld provided a starting point for the phenomenological sociology of Alfred Schütz, who tried to synthesize Husserl's phenomenology of consciousness, meaning, and the life-world with Max Weber's sociology and its focus on subjectively meaningful action. Jürgen Habermas has further developed the concept of the lifeworld in his social theory. For Habermas, the lifeworld is more or less the "background" environment of competences, practices, and attitudes representable in terms of one's cognitive horizon. Compared to Husserl with his focus on consciousness, however, Habermas, whose social theory is grounded in communication, focuses on the lifeworld as consisting of socially and culturally sedimented linguistic meanings. It is the lived realm of informal, culturally-grounded understandings and mutual accommodations. Rationalization and colonization of the lifeworld by the instrumental rationality of bureaucracies and market-forces is a primary concern of Habermas's two-volume Theory of Communicative Action.

For Habermas, communicative action is governed by practical rationality—ideas of social importance are mediated through the process of linguistic communication according to the rules of practical rationality. By contrast, technical rationality governs systems of instrumentality, like industries, or on a larger scale, the capitalist economy or the democratic political government. Ideas of instrumental importance to a system are mediated according to the rules of that system (the most obvious example is the capitalist economy's use of currency). Self-deception, and thus systematically distorted communication, is possible only when the lifeworld has been 'colonized' by instrumental rationality, so some social norm comes into existence and enjoys legitimate power even though it is not justifiable. This occurs when means of mediating instrumental ideas gains communicative power—as when someone pays a group of people to stay quiet during a public debate, or if financial or administrative resources are used to advertise some social viewpoint. When people take the resulting consensus as normatively relevant, the lifeworld has been colonized and communication has been systematically distorted. The 'colonization' metaphor is used because the use of steering media to arrive at social consensus is not native to the lifeworld—the decision-making processes of the systems world must encroach on the lifeworld in a way that is in a sense imperialistic:

When stripped of their ideological veils, the imperatives of autonomous subsystems make their way into the lifeworld from the outside—like colonial masters coming into a tribal society—and force a process of assimilation upon it. The diffused perspectives of the local culture cannot be sufficiently coordinated to permit the play of the metropolis and the world market to be grasped from the periphery.^[7]

The fragmentation of consciousness associated with the two Marxist concepts of alienation and false consciousness illustrate why, in Habermas' perspective, they are merely special cases of the more general phenomenon of lifeworld colonization.

Social coordination and systemic regulation occur by means of shared practices, beliefs, values, and structures of communicative interaction, which may be institutionally based. We are inevitably lifeworldly, such that individuals and interactions draw from custom and cultural traditions to construct identities, define situations, coordinate action, and create social solidarity. Ideally this occurs by communicatively coming to understanding (German Verstehen), but it also occurs through pragmatic negotiations (compare: Seidman, 1997:197).

The lifeworld is related to further concepts such as Pierre Bourdieu's notion of habitus and to the sociological notion of everyday life.

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