Paragraphs stick to their topic. Paper is written in correct, standard English without spelling mistakes. Thesis relates to question. Thesis is supported with arguments. Most elements in the argument are supported by convincing evidence.
Paper attempts to refute apparently contradictory evidence.
Paper makes no major factual errors. Paper is organized with a clear thesis. Paragraphs generally stick to one topic. Paper is written in correct, standard English with occasional spelling mistakes and minor grammatical errors. All sources are cited properly.