In the past I have recommended a loophole in the credit reporting system to quickly improve a credit score. By being added to an existing account with long history of on time payments, a borrower was able to have that history factored into their score. Today in the Mortgage Market Guide , my weekly Realor newsletter the closing of this loop hole was discussed. Fair Issac, the company that writes the software for credit scores, is looking out for "autorized users" and underweighting or not weighting that in the score.
Follow the following link to read the whole story.
Paul's MMG Weekly