# Observation Theory

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```{attributiongrey} Attribution
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This chapter is written by Sandra Verhagen and Sami Samiei Esfahany. {ref}`Find out more here <observation_theory_creditt>`.
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This chapter contains the prerequisites for the [Observation Theory chapter](./overview.md) in the main part of the book. This chapter is not assessed on its own in the final exam, but the content is required for understanding the contents of the chapter.