No mistakes in grammar, spelling, or punctuation. Most details are accurate. Written in the student's own words. Words are well-chosen. Not more than 3 mistakes in grammar, spelling, or punctuation.
Some details are accurate.
Written in the student's own words. Words are well-chosen. Not more than 6 mistakes in grammar, spelling, or punctuation. Details are accurate, but few in number. Most of it is written in the student's own words.