As per Aristotle a scientific demonstration starts by looking for the explanation or reason for a reality. Aristotle observes that deductive reasoning (logic) can't show the fundamental idea of a thing. Nonetheless, he disputes that scientific demonstrations do display the fundamental idea of things. He brings up the idea of thunder and Aristotle contends about the inquiry "For what reason does it thunder?", (AGP, Pg. 474, 93b 5-10). This question can be drawn closer to its deductive reasoning, because it searches for a cause. This logic prompts to the conclusion that thunder happens because the fire in a cloud is extinguished. This logic's conclusion focuses to the way that the fundamental idea of thunder is the extinguishing of fire inside a cloud. But unfortunately, it is the reason and not the fundamental nature that is clarified by the deductive reasoning, we might only know the facts but not the reason. It’s derived that the understanding of the primary starting points of a scientific demonstration is the result of experience, as through perception we can get experience and lastly knowledge derived from understanding.