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Jar testing is a method of simulating a full-scale water treatment process, providing sys-tem operators a reasonable idea of the way atreatment chemical will behave and operatewith a particular type of raw water.
The Einstellung effect has been tested experimentally in many different contexts. The most famous example (which led to Luchins and Luchins' coining of the term) is the Luchins' water jar experiment, in which subjects were asked to solve a series of water jar problems.nother phenomenon similar to Einstellung is functional fixedness (Duncker 1945). Functional fixedness is an impaired ability to discover a new use for an object, owing to the subject's previous use of the object in a functionally dissimilar context.