Only with the understanding of structural theories that emerged during the 19th and 20th century did the professional structural engineer come into existence.

Another trend in biogenetic structural theory has been to extend the age at which society influences neurocognitive development back into very early life.

This line of investigations is today known as structural theory of the empirical sciences.

Kitchener was hoping to put together a structural theory that went beyond Grand Unification.

According to social structural theory, the division of labor and social expectations lead to gender differences in sociosexuality.

Also, it was the first appearance of his "structural theory" consisting three new concepts id, ego, and superego.

Furthermore, some highly capitalist states such as Switzerland have very low crime rates, thus making structural theory seem improbable.

Similar arguments have been made concerning structural theories of the capitalist nature of the state.

Her work provided a bridge between Freud's structural theory and ego psychology.

Hence it is a structural theory of crime.