Almost every theory described in this article has an action.

She described her theory that a man's ability as a lover can be determined by what kind of dog he has.

He described the theory and advantages, but no practical use resulted.

This is one method for producing complete theories, described below.

In it he described the theory as worth considering.

Abrams described the theory and practice of spondylotherapy in a 1910 book by that name.

Another author is free to describe the same theory in her own words without infringing on the original author's copyright.

This article describes their theory, which is unsupported by academic historians.

Frank Crow published a paper describing the theory of shadow volumes in 1977.

The requisite Microsoft piece describes the economic theory behind the antitrust case.