General Motors, once reluctant to change agencies on its principal brands, is doing so for the second time in four months.

Two consumer marketers said yesterday that they would change agencies.

Today, however, it's not unusual for a marketer to change agencies after two or three years.

FOR the third time in a week, a number of big national advertisers have all changed agencies on the same day.

In the last year, at least 17 restaurant chains, with total advertising budgets of more than $2.5 billion, have changed agencies.

The account changed agencies without a review, he added.

The decision to change agencies was made without a review.

It's a signal from telecommunications clients, who are calling more frequently to change agencies.

It even, from time to time, causes them to change agencies.

Two advertisers said yesterday that they had changed agencies.