Ageist stereotyping is a tool of cognition which involves categorizing into groups and attributing characteristics to these groups. Stereotypes are necessary for processing huge volumes of information which would otherwise overload a person, and they are often based on a "grain of truth" (for example, the association between aging and ill health). However, they cause harm when the content of the stereotype is incorrect with respect to most of the group or where a stereotype is so strongly held that it overrides evidence which shows that an individual does not conform to it. For example, age-based stereotypes prime one to draw very different conclusions when one sees an older and a younger adult with, say, back pain or a limp. One might well assume that the younger person's condition is temporary and treatable, following an accident, while the older person's condition is chronic and less susceptible to intervention. On average, this might be true, but plenty of older people have accidents and recover quickly and very young people (such as infants, toddlers and small children) can become permanently disabled in the same situation. This assumption may have no consequence if one makes it in the blink of an eye as one is passing someone in the street, but if it is held by a health professional offering treatment or managers thinking about occupational health, it could inappropriately influence their actions and lead to age-related discrimination. Managers have been accused, by Erdman Palmore, as stereotyping older workers as being resistant to change, not creative, cautious, slow to make judgments, lower in physical capacity, uninterested in technological change, and difficult to train.[16] Another example is when people are rude to children because of their high pitched voice, even if they are kind and courteous. A review of the research literature related to age stereotypes in the workplace was recently published in the Journal of Management