Experimentation Source 14 (Source)

Reference Documentation - Reference Name

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Every time you experiment, the item complexity raises by 1, which raises the risk of failure. (I also heard that higher complexity item requires higher rate of insurance, though I cannot verify this). It�s recommended to spend multiple points every experiment to reduce the chance of failure. Also you should only spend points in one attribute only in every experiment attempt since addition attributes beyond the first attribute adds +5% to the total risk. It�s better to spread the experiments on several attempts and one attribute per attempt.