Editing Commonsense reasoning (section)

=== Qualitative reasoning ===
{{main|Qualitative reasoning}}

Qualitative reasoning<ref>{{Cite web|url = https://techcrunch.com/2014/08/09/guide-to-common-sense-reasoning-whos-doing-it-and-why-it-matters/|title = Qualitative reasoning| date=9 August 2014 }}</ref> is the form of commonsense reasoning analyzed with certain success. It is concerned with the direction of change in interrelated quantities. For instance, if the price of a stock goes up, the amount of stocks that are going to be sold will go down. If some ecosystem contains wolves and lambs and the number of wolves decreases, the death rate of the lambs will go down as well. This theory was firstly formulated by [[Johan de Kleer]], who analyzed an object moving on a roller coaster.

The theory of qualitative reasoning is applied in many spheres such as physics, biology, engineering, ecology, etc. It serves as the basis for many practical programs, analogical mapping, text understanding.