Judaism as a Civilization in the context of Mordecai M. Kaplan

Reconstructionist Judaism is a Jewish movement based on the concepts developed by Rabbi Mordecai Kaplan (1881–1983)—namely, that Judaism is a progressively evolving civilization rather than just a religion. The movement originated as a semi-organized stream within Conservative Judaism, developed between the late 1920s and the 1940s before seceding in 1955, and established a rabbinical college in 1967. Reconstructionist Judaism is recognized by many scholars as one of the five major streams of Judaism in America alongside Orthodox, Conservative, Reform, and Humanistic.

There is substantial theological diversity within the movement. Halakha (Jewish law) is not considered normative or binding, but rather serves as the basis for the ongoing evolution of meaningful Jewish practice. In contrast with the Reform movement's stance during the time he was writing, Kaplan believed that "Jewish life [is] meaningless without Jewish law." One of the planks he wrote for the proto-Reconstructionist Society for the Jewish Renaissance stated, "We accept the halakha, which is rooted in the Talmud, as the norm of Jewish life, availing ourselves, at the same time, of the method implicit therein to interpret and develop the body of Jewish Law by the actual conditions and spiritual needs of modern life." The movement also emphasizes positive views toward modernity. It has an approach to Jewish customs that aims toward communal decision-making through a process of education and distillation of values from traditional Jewish sources.