Article quoted from another one. With the following quote:

I ended 2007 with a blog post which I was told was quite widely read within Amazon: Amazon, Web Services, and Sesame Street. In that post, I complained about the problem of Eventual Consistency and argued for a marginally stronger model: Eventually Known Consistency, which still takes the "A" route out of the CAP theorem, but exposes enough internal state that users can also get "C" in the happy path.