Hi,
Try NPS (Net Promoter Score), though market researchers disagree with this type, it is evidently working in big corporations. This survey has a series of questions about the experience on the previous call, time taken to reach the desk, accent and courtesy of the advisor or the agent, speed of service etc. The scaling for each question will be done on a scale of 1 to 5 where one is the least (totally disagree) to 5 being the best (outstanding). I guess you can decide on the wordings. Then there is the ultimate question "On a scale of 0 to 10, how likely is it that you like to recommend your friends and family to this service?". In the above scale if the customer rates the likleyhood between 0 to 6 then the customer is a DETRACTOR, if he rates 7 or 8 then the customer is PASSIVE and if the customer rates 9 or 10 then the customer is a PROMOTER. NPS is calculated as (Total Promoters - Total Detractors)/Total surveys.
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