All human knowledge is socially constructed, i.e. no area of human endeavor can ever be neutral or value-free since it is always underpinned by the values and beliefs, both conscious and unconscious, of its proponents. Such sets of beliefs or worldviews are examples of what sociologists call ideologies. Education itself can therefore never be 'neutral' or 'value free', whatever critics may say. Meghan & Haber, in A Sociology of Educating (2007) define ideology as: