There is no central authority within the New Age phenomenon that can determine what counts as New Age and what does not. Many of those groups and individuals who could analytically be categorised as part of the New Age reject the term "New Age" in reference to themselves. Some even express active hostility to the term. Rather than terming themselves "New Agers", those involved in this milieu commonly describe themselves as spiritual "seekers", and some self-identify as a member of a different religious group, such as Christianity, Judaism, or Buddhism. In 2003 Sutcliffe observed that the use of the term "New Age" was "optional, episodic and declining overall", adding that among the very few individuals who did use it, they usually did so with qualification, for instance by placing it in quotation marks. Other academics, such as Sara MacKian, have argued that the sheer diversity of the New Age renders the term too problematic for scholars to use. MacKian proposed "everyday spirituality" as an alternate term.