All problems are not equal: some can be solved only with facts while others require assumptions. Adapt your confidence accordingly.

### Problems are not all alike

Morgan Jones’ The Thinker’s Toolkit separates problems according to their complexity.

The simplest problems—deterministic and direct problems—are those for which a single, exact answer exists. The answer is a fact and you only have to find the data (usually a Google search will do): how deep is the Danube river in Vienna, how many US president has there been, etc.

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