Jane Loevinger Weissman (February 6, 1918 – January 4, 2008) was a developmental psychologist who developed a theory of personality which emphasized the gradual internalization of social rules and the maturing conscience for the origin of personal decisions. She also contributed to the theory of measurements by introducing the coefficient of test homogeneity. In the tradition of developmental stage models, Loevinger integrated several "frameworks of meaning-making" into a model of human´s constructive potentials that she called ego development or Ich-Entwicklung. The essence of the ego is the striving to master, to integrate, and make sense of experience. Her contributions to empirical research on patterns of personal developement enriches our understanding of fundamental human capacities for sensing our inner and outer world.