Editing Insight (section)

====Four-stage model====
According to the four-stage model of insight, there are four stages to problem solving:<ref name="Hadamard (1975)">{{cite book |last=Hadamard|first=Jacques|title=An essay on the psychology of invention in the mathematical field |year= 1954|orig-year=1945| publisher=Dover Publ.|location=New York, N.Y.|isbn=978-0-486-20107-8 |lccn=54-4731|url-access=registration|url=https://archive.org/details/essayonpsycholog00hada}}</ref>
# The person prepares to solve a problem.
# The person incubates on the problem, which encompasses trial-and-error, etc.
# The insight occurs, and the solution is illuminated.
# The verification of the solution to the problem is experienced.
Since this model was proposed, other similar models have been explored that contain two or three similar stages.<ref name="Nature of insight" />