To psychologists Adler (1927/1954) and Maslow (1954), fully mature individuals care deeply for all humanity, not just for their own ingroups. This paper reports a series of studies with a new measure of that caring, the Identification With All Humanity Scale (IWAH). These studies together show that identification with all humanity is more than an absence of ethnocentrism and its correlates and more than the presence of dispositional empathy, moral reasoning, moral identity, and the value of universalism. Across these studies, the IWAH predicted concern for global human rights and humanitarian needs (Studies 1 and 2), was temporally stable (Study 3), and correlated with how close others see one as being (Study 4). The IWAH strongly distinguished members of 2 known groups from a general adult sample (Study 5). It predicted valuing the lives of ingroup and outgroup members equally (Study 7), knowledge of global humanitarian concerns (Study 8) and choosing to learn about these concerns (Study 9), and a willingness to contribute to international humanitarian relief (Study 10). In regression analyses, it predicted these results beyond related constructs. Although psychologists have focused extensively upon negative qualities such as ethnocentrism and its roots, we suggest that the positive quality of identification with all humanity also merits extensive study.

Studies of those who rescued Jews during the Holocaust suggest that their most shared quality was a sense "of belonging to one human family" (Monroe, 1996, p. 205), caring deeply about human beings without regard for their race, religion, or other distinction. In this article, we first note the development of the concept of "one humanity" since the late 15th century, and then we summarize recent work with a new measure of that caring-the Identification With All Humanity Scale (IWAH). Research with the IWAH establishes that identification with all humanity is more than (a) an absence of prejudice and its sources and (b) the sum of positive qualities, such as dispositional empathy and principled moral reasoning. Many people appear to intuit that a mature moral person would identify with all humanity, even when they do not do so themselves. Finally, a brief discussion is offered of how identification with all humanity may develop or could be taught.

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