In his latest consumer survey, consultant Bruce Brittain tracked two of the strongest cobranded cards on the market, finding that the AT&T Universal card had had slow growth and the General Motors card a portfolio decline of nearly 15% in the past 12 months.

Mr. Brittain of Atlanta-based Brittain Associates Inc. last measured the two programs a year ago and found that since then about 500,000 households had dropped the GM card, while 100,000 had picked up the AT&T Universal card.

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