It is hard enough to differentiate among three tired techniques.

The public did differentiate among critics of the Clinton plan, taking small business more seriously than doctors or insurance companies.

Each day seemed exactly like the last, and she had trouble differentiating among them.

And to differentiate among wines, even if just for yourself, you at least have to make the effort.

Whatever the system used, it is fairly standard to differentiate prices among users.

Then it occurred to her that the only way to differentiate among them was by the counting words.

The doctor, trying to make a diagnosis, must differentiate among the many kinds of pain.

Companies are moving to differentiate themselves, especially among new users, of whom there will be a record number this year.

"But there has been no effort to differentiate among companies."

But it can be difficult to differentiate, even among schools with the same themes.