The Advocacy Index is a customer survey technique developed by VIRTUATel Ltd that is conducted over the telephone. SourceWire The technique measures customer loyalty using a 3-point scale and is based on the Net Promoter Score (NPS) methodology developed by Fred Reichheld. Frederick F. Reichheld (December 2003). "The One Number You Need to Grow". Harvard Business Review.
As they had experience in the area of automated customer surveys, VIRTUATel incorporated the Net Promoter survey technique for driving up-sell, cross-sell and customer retention rates but simplified the 0 to 10 score to use a simple 3 option scale to determine if the survey recipient was an Advocate, Neutral or a Non-Advocate.
The Advocacy Index uses the survey question "would you recommend us..." to create a score showing Advocacy Index.
The value of the "Advocacy" question in customer a survey is confirmed in research by Dr Paul Marsden of LSE in "Advocacy Drives Growth" published in 2005. This in turn, builds on extensive research in the US by Frederick F Reichheld, consultant to Bain & Co., who created the Net Promoter Score (NPS) methodology.
The research found that both word of mouth advocacy (as measured by net-promoter score) and negative word of mouth were statistically significant predictors of annual 2003-2004 sales growth: Sourcewire
The report concludes by suggesting that asking a simple question; "Would you recommend this company?" the answer provides a measure of word of mouth advocacy that may be useful not only in predicting sales growth, but also in predicting share performance and employee productivity.
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