However, it is often unclear whether it is NSI or ISI at work in research studies (or real life). For example, Asch found that conformity is reduced in the presence of dissenter - the dissenter may reduce the power of NSI (provide social support) or ISI (provide alternative source of information). Both interpretations are possible and so consequently, it is hard to separate ISI and NSI, as both processes probably operate together in most real-world conformity situations, rendering the distinction between the two explanations as useless.