Pursuant to UWS 10.01, academic staff appointments may be fixed-term, probationary, or indefinite upon appropriate approval by the chancellor. Rights associated with an appointment are limited to the operational area specified in the letter of appointment, and the funding source alone will not automatically determine the type of appointment. Appointments of less than 50% time or appointments intended to fill a need of predetermined duration specified in the employment contract shall be fixed-term. Appointments at 50% time or greater for which there is reasonable expectation of continuing need shall be probationary or indefinite.