 Course evaluations are implemented in one of two ways, either summative or formative.Course evaluation instruments generally include variables such as communication skills, organizational skills, enthusiasm, flexibility, attitude toward the student, teacher – student interaction, encouragement of the student, knowledge of the subject, clarity of presentation, course difficulty, fairness of grading and exams, and global student rating.Summative evaluation occurs at the end of a semester, usually a week or two before the last day of class.