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no.... you can still get a band 5 or 6 without historiography but chances are slimIt is definitely necessary if your going for band 5/6 work. Its in the rubric and you need historiography to 'back' a statement or thesis that your making.
Like english, its like making a statement without textual references.
+1i don't think its necessary for you to have historiography, but it is recommended that you do so in order to provide an array of historical perspectives on the issue at hand.