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One of the strong points they mentioned, was to have PlayTesters testing the game and new features
during development.
The Developers where not allowed to interact with the Testers, and only set up the game, and monitor
their Problems.

This of course is the most objective method to value new features, and resolve
personal opinions within the development.
But its also quite costly.

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Although, I doubt that the tester feel comfortable while playing the game!

I don't think it is costly. We shouldn't mix up the job 'tester' who has to search for bugs and find reliable ways to repeat the bug with that testers that they mean: those are simply guys who like to play such a game, and I guess you find enough people who enjoy playing a game in development without getting anything payed.

The team of Crysis did such tests each second to fourth week, too.