The theory has been gaining gradual support over the last decade among psychologists.

Just what motivated him is not clear, but two theories are gaining adherents.

Opinion polls show that the theory is gaining public credibility.

Until recently, no theory of migration had gained wide acceptance.

While no theory has gained a consensus, some are more notable and widely published than others.

The theory has also gained support in some nationalist circles.

The theory gained much support, as it was known to be more common on light gritty soils.

The theory of elite, capitalist control of the political system in the 20th century has gained less attention and support.

It would be hard to hold them together if that theory gained credence.

This theory has gained much support in the environmentalist movement.