Historians read the first part, then jump to the end and ask themselves:
Who wrote this?
When was it written?
What else do I need to know to make a considered and valued judgment?
What is the author's point of view?
Why was it written?
Is this source believable? Why? Why not?
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Before we accept this as fact or true, we ask ourselves the above questions. (This is called Sourcing)
It's critical thinking and evaluation. It's worthwhile. Not just filling in worksheets.