Constructivism and interpretativism are related concepts that address understanding the world as others experience it. Max Weber and Georg Simmel introduced interpretive paradigm into sociology with respect to an outside observer of a culture (such as an anthropologist or sociologist) relating to an indigenous people or sub-cultural group with the group’s perspective of understanding meaning in a natural setting, rather than interpreting them in terms of his or her own culture. Positivism holds observation and reason as means of understanding human behaviour as true knowledge is based on experience of senses and can be obtained by observation and experiment. Critical paradigm describes a situation from a particular vantage point or set of values. It looks to question the 'natural' state; challenge the mechanisms for order maintenance; and, change the situation.