Funding Sources and Revenues While most progressive think tanks acquire their funding through many different sources, for conservative think tanks financing by corporations prevails. Among the think tanks receiving a considerable amount of corporate money are the Cato Institute (U.S. conservative/libertarian), the Brookings Institution (U.S. centrist), the Heritage Foundation (U.S. conservative), the American Enterprise Institute (U.S. conservative) and the Competitive Enterprise Institute (U.S. conservative). Also, whereas the combined revenue base of such conservative multi-issue policy institutions as the Heritage Foundation, the American Enterprise Institute, Free Congress Research and Education Foundation, the Cato Institute, and Citizens for a Sound Economy exceeded US$ 77 million in 1995, the roughly equivalent U.S. progressive Institute for Policy Studies, the Economic Policy Institute, Citizens for Tax Justice, and the Center for Budget and Policy Priorities had only US$ 9 million at their collective disposal in 1995.

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Fuzzy logic A superset of Boolean logic (George Boole) introduced by Lotfi Zadeh in the 1960s as a means to model the uncertainty of natural language. Fuzzy logic is a type of logic that recognizes more than simple true and false values. It represents a departure from classical two-valued sets and logic, that use "soft" linguistic (e.g. large, small, hot, cold, warm) system variables and a continuous range of truth values in the interval [0,1], rather than strict binary (true or false) decisions and assignments.

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