Accuracy—good biology is accurate and authentic; fictionalized biography conveys the essence of the character if not always the specific details of their life. There should be no glaring omissions from the person life that would distort the readier view or understanding of that person. Can document evidence and research upon which the writing is based. Endnotes , footnotes, bibliographies, and indexes can be added to books for readers older than second grade.
Balance –today ,biographies are preferred which show the human said of people—their errors in judgment, personality flaws ,eccentric habits, etc.—balanced with the glorious exploits.