  Therefore he recognized only two methods, which he labeled demonstrative and resolutive. Demonstrative method (or composition) proceeds from cause to effect and involves demonstration “of the reasoned fact” or “most powerful” demonstration, best exemplified in the mathematical sciences. Resolutive method (or resolution) proceeds from effect to cause and, despite its name, also involves demonstration, but of an inferior kind, that is called demonstration “of the fact” or “from a sign”. Related to this alter type of demonstration is the process of induction (inductio), which is helpful for discovering principles that are known naturally but are not immediately evident. Zabarella believes that, by the force of induction, human intellect is capable of distinguishing the universal, which is hidden in particulars.  Induction, or resolutive method makes up the first phase in the regressus-method, which was, in his opinion, the only proper method for natural philosophy.