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Alternatives to modes such as the [[undo]] command and the [[Recycle bin (computing)|recycle bin]] are recommended when possible.<ref name="Implementation">{{cite web|url=http://quince.infragistics.com/Patterns/Modal%20Panel.aspx#Implementation|title=Modal Panel - Implementation|website=Infragistics.com]|url-status=dead|archive-url=https://web.archive.org/web/20130506101851/http://quince.infragistics.com/Patterns/Modal%20Panel.aspx#Implementation|archive-date=2013-05-06}}</ref> HCI researcher [[Donald Norman]] argues that the best way to avoid mode errors, in addition to clear indications of state, is helping the users to construct an accurate [[mental model]] of the system which will allow them to predict the mode accurately.<ref>{{cite journal|title=Design rules based on analyses of human error|year=1983|doi=10.1145/2163.358092|last1=Norman|first1=Donald A.|journal=Communications of the ACM|volume=26|issue=4|pages=254–258|s2cid=47103252|doi-access=free}}</ref>
This is demonstrated, for example, by some [[stop sign]]s at road intersections. A driver may be [[Operant conditioning|conditioned]] by a [[four-way stop]] [[sign]] near his or her home to assume that similar intersections will also be four way stops. If it happens to be only two way, the driver could proceed through if he or she sees no other cars. Especially if there is an obstructed view, a car could come
===Proper placement===
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