Specific words and expressions are used accurately and convincingly. Minor errors in conventions and structure do not detract from the clarity or effectiveness of communication. Specific words and expressions are used accurately and often effectively. Minor errors in conventions and structure do not reduce the clarity of communication. General words and expressions are sometimes used when specific words would have been more effective, and words are generally used accurately.
Communication is understood despite errors in conventions and structure.
General words predominate and specific words, if present, are frequently misused. Errors in conventions and structure impede communication. Words are frequently misused. Constant errors in conventions and structure impede communication. Original sources only are used.