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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.
Just about Right (JAR) scales are commonly used in consumer research to address these questions. JAR scales measure the appropriateness of the level of an attribute. Usually after rating overall liking, the respondent is asked to give their opinion of the intensity of specified product attributes in relation to their âJust about Rightâ level. For example, they may be asked if the sweetness is âtoo highâ, âtoo lowâ or âJust about Rightâ. The JAR scales are usually category type scales with 5 points with the anchors as below: Too sweet; Slightly too sweet; Just about right; Slightly not sweet enough