Quality as a variable refers to qualitative changes in the production process.

"There has been a qualitative change in the Government's position," he said.

By about 1500, however, there was a qualitative change in world history.

It was only during the past decade and a half that the situation underwent a qualitative change.

Thus, the development of working memory can be described as quantitative growth rather than a qualitative change.

Economic development can also be referred to as the quantitative and qualitative changes in the economy.

We also have to conclude that there has been a qualitative change for the worse in Russia.

"Merely quantitative differences, beyond a certain point, pass into qualitative changes."

This demographic growth would strongly support the other qualitative changes.

Approximately 140 days after the stimulation began, qualitative changes in behavior emerged.