[This PDF](http://media.wix.com/ugd/bbfb8a_2ea66bffc09b40d099237bb8381346f1.pdf http://media.wix.com/ugd/bbfb8a_2ea66bffc09b40d099237bb83813... ) appears to pro

[This PDF](http://media.wix.com/ugd/bbfb8a_2ea66bffc09b40d099237bb8381346f1.pdf http://media.wix.com/ugd/bbfb8a_2ea66bffc09b40d099237bb83813... ) appears to provide information about their methodology -- noting it was linked from [this article](https://www.macrumors.com/2015/07/20/apple-watch-tops-iphone-ipad-customer-sat/ https://www.macrumors.com/2015/07/20/apple-watch-tops-iphone... ). In short, it looks like potential-respondents first had to apply (e.g., in response to [this Facebook post](https://www.facebook.com/Wristly.co/posts/apple-watch-owner-join-our-inner-circle-be-in-the-know-and-help-shape-the-future/372856999575519/ https://www.facebook.com/Wristly.co/posts/apple-watch-owner-... )), and then they pre-screened potential-respondents.. and it sounds like respondents may have had some sort of a weekly commitment?, as the document includes: > To finish, a big thank you to the 1,100+ strong members of the Wristly Inner Circle- we wouldn’t be able to learn so much so fast about the Apple Watch without your weekly contribution. So it doesn't sound like a random sampling of Apple-product users. Anyway, then apparently they ask if a respondent's satisfied with a product, giving 4 options: "Very Satisfied/Delighted", "Somewhat Satisfied","Neither Satisfied or Dissatisfied", and "Somewhat Dissatisfied". Then, they add up the first 2 categories as their "key metric of customer satisfaction". --- To note it, [this blog-post](https://daringfireball.net/linked/2018/04/20/iphone-x-customer-satisfaction https://daringfireball.net/linked/2018/04/20/iphone-x-custom... ) claims to quote "Ben Bajarin, on the result of a survey of iPhone X owners conducted last month" saying: > When it came to overall customer satisfaction, iPhone X owners in our study gave the product an overall 97% customer satisfaction. [...] Just to contrast that with the original Apple Watch research with Wristly I was involved in, 66% of Apple Watch owners indicated they were very satisfied with Apple Watch, a product which also ranked a 97% customer satisfaction number in the first Apple Watch study we did. Point being that, while the above PDF appears to talk about the Apple Watch, it sounds like they're strongly implying that the customer-satisfaction figures for the iPhone were largely done in a similar manner -- and, at least in the case of the above-quoted speaker, by some of the same people.