But just as Freudian theory has evolved, so have the couches used in therapy.

Over the decades, superstitious theory has evolved around selecting the proper animal, much of it involving dreams.

His theory evolved over the decades, and the description in later writings is somewhat different.

For a theatrical piece exploring how the theory of light has evolved over the centuries.

As the theory and practice of social work evolved, new approaches were used to solve the problems of welfare.

Thus, the theory 'is continually evolving as it is brought to bear on solving problems of a research or practical nature'.

This theory evolved over time to produce models more closely resembling real-world social networks.

Radiation From Everywhere The theory has been evolving since the beginning of this century.

The book discusses how different theories of the universe evolved, along with a personal look at the people involved.

The theories discussed below may have evolved from different assumptions, but it is still difficult to discriminate completely between them.