| Research Assistantship | Fixed amount of money for conducting research on a specific project under the supervision of a particular professor | Typically accompanies tuition waiver, thus adequate for survival | Typically does not accompany tuition waiver, thus adequate for survival but can be augmented with ad hoc employment in teaching support  | 
| Teaching Assistantship | Fixed amount of money for supporting teaching activities, as in tutoring, grading home work and supervising laboratories | Typically accompanies tuition waiver, thus adequate for survival | Does not typically exist in Canada. Teaching support activities are ad hoc employment opportunities. | 
| Ad Hoc Employment | Hourly-wage jobs. Skilled: tutoring, grading home work and supervising laboratories Menial: such as a receptionist, re-shelving books in a library | Those on research or teaching assistantship can not take up such jobs. All others are eligible, for up to 20 hours per week. | Students with or without research assistantship can take up only skilled jobs. |