Nonprobability sampling methods include convenience sampling, quota sampling and purposive sampling. The main difference between behaviorism and Tolman's purposive behaviorism is that behavior is goal oriented. The purposive interpretation involves a rejection of the exclusionary rule. Nature is explained with the same conscious and purposive manner as human activity. Emotions are rational and purposive; just as actions are. Purposive interpretation is also used in constitutional interpretation. He is prepared to use Justice Foster's purposive approach doctrine as the legal rationale. Functionalization is achieved by treating discourse as a purposive act. Archaeological field surveys can also be characterized as either "purposive" or "sampling" surveys. Kant attempted to legitimize purposive categories in the life sciences, without a theological commitment. Their three main ideas are&colon; purposive, value-laden, and pragmatic. It is defined as purposive striving and is one of the primary human psychological functions. But Aristotle acknowledges that desire cannot account for all purposive movement towards a goal. Hong Kong courts use the purposive approach to interpret the Basic Law. The base may be further complicated by ambulative or purposive morphemes.