Later, during the late nineteenth-century, several influential neurologists studied language in an attempt to construct a theory of cognition.

In matrix mechanics, the correspondence principle was built in and was used to construct the theory.

It was a long way, however, from acknowledging the existence of the polyp to constructing the theory of natural selection.

Often, social scientists begin constructing a theory by observing aspects of social life, seeking to discover patterns that may point to more or less universal principles.