The theories had always failed when put into practice.

The theory is relatively new and fails to address some pertinent issues.

The theory fails to address much of social life.

"The problem is that the theory fails to work with any consistency," he explained.

But theory and reality often fail to converge in this land.

The strategic theories he'd believed in had failed to an extent.

Rohl's theory has failed to find support among scholars in his field.

The theories have failed to impact most policy makers and academics.

The theory also fails to explain what is meant when Matthew states they were "seen by many."

However, this theory also failed to explain skating at low temperature.