What is the difference between a “positive time reporter” and an “exception time reporter”?

Positive reporters are those who must report their time every week in order to be paid. Generally speaking, this category includes undergraduate and graduate hourly employees, temporary employees (03s), departmental assistants, etc. Exception employees (including most regular, permanent, full-time, non-student employees) are assumed to be working a set schedule and need to report “exceptions” to that schedule (such as sick time or vacation). Job aids for reporting time can be found here.