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ion – a powerful invention Thinking in alternatives is important for progress since we develop new ideas by changing existing descriptions. Therein, abstraction as a thought pattern plays a major role, even though it is often used in the pejorative sense: “...too abstract”. Yet, a plead for abstraction would include the following topics: • Language and the structure of knowledge: according to current cognitive theories, we group our concepts in taxonomies. With these hierarchies, properties from the generic terms are inherited to the specific terms. This allows also to derive conclusions about