Bloom's Taxonomy has helped teachers plan lessons and design instruction for decades now.

While other theories and systems have come and gone, Bloom's taxonomy appears to have become the most commonly used standard in many educational settings.

In the 1990's, Lorin Anderson and a group of psychologists updated the taxonomy in the hope that it would have more relevance for 21st century students and teachers, transforming the nouns to verbs and making some other seemingly small but significant changes.

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