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People interested in this might also like the "Friends and Family test", which is used extensively in the English NHS.

http://www.nhs.uk/NHSEngland/AboutNHSservices/Pages/nhs-frie...

https://www.england.nhs.uk/ourwork/pe/fft/

That's virtually the exact same thing as the question we're asking, which is virtually exactly the same as NPS (net promoter score). Thank you for the links, I hadn't seen those ones before.

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