"Our contract with him states that we are to keep him informed of any changes in conditions that may materially alter the business climate."

The third exception, whether the additional terms materially alter the contract, is the most difficult to apply.

Economically, in only a few cases will the conviction materially alter the performance of the employee or indeed those with whom he works.

"We think its fair to say we don't believe F-16s would not materially alter the balance."

May said the deal would not materially alter its financial position or earnings results.

Look at what the item is to determine whether the new terms "materially alter" the original offer.

I can't imagine what we might learn that would materially alter our plans.

These fortunate conditions materially alter the outlook; serious consequences of the operation itself need not be feared.

It would "materially alter the climate in adjacent areas."

Dilution with water or another substance that does not materially alter the characteristics of the product.