I take this opportunity to point out Paul Cockshott's book "Towards a New Socialism" where he goes down to detail on how an entire economy could function with cybernetic economic planning. Even if you're not interested in socialism, it still has some great ideas and insights that could be implemented in some sort of social democracy.
The complete book is available here:
http://ricardo.ecn.wfu.edu/~cottrell/socialism_book/new_soci...