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How do children build their vocabularies so quickly? Researchers have discovered that they can connect a new word with an underlying concept after only a brief encounter, a process called fast mapping.
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Once children fast-map a word, they often have to refine  their first guess about  its meaning. One day , Sammy heard Leslie announce to the children that they would soon take a field trip.(Sammy  is a preschooler and Leslie is  his teacher.) He excitedly  told  his mother ,  "We are going on a field trip!" When she asked where the class would go, Sammy responded matter-of-factly, "To a field, of course."

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