When lawyers at GE Canada rate external counsel, they state how likely they would recommend the external lawyer to someone else. As explained in the ACC Docket, Vol. 27, Oct. 2009 in an ad supplement by Ogilvy Renault after page 64, lawyers use ratings of 9-10 (“likely to recommend that lawyer to someone else”), 7-8 (“unlikely to recommend”), and 0-6 (“absolutely not”) (See my post of Nov. 8, 2009: overall performance questions on surveys.).
Once all the ratings are in for a firm, someone discards ratings of 7-8 and then subtracts the ratings of 0-6 from ratings of 9-10 to arrive at a net rating score. Ignore the middle, then subtract the low scores from high scores. This methodology applies Frederick Reichheld’s widely used Net Promoter Score (See my post of Oct. 18, 2006: net scores combined.).