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Dan Cook is an emeritus game designer whose last released games with his company spry fox did quite an impact in the world of gamers in (re)inventing some well established games genre.
In this (quick) talk, he gives 7 tools as well as a lot of insights on his professional experience.
You should go and read his blog : lostgardens.com with a great articles about game design and game grammar. (Dan Cook is somewhat of a researcher/thinker about game design and the workflow and meaning of making a game)