Teaching assistantships typically require a defined workload, often described as a percentage appointment or a weekly hour expectation. Departments may advertise 25–50 percent appointments that correspond to a set number of hours per week. These positions usually include a tuition waiver and a stipend but also require regular instructional duties such as leading seminars, grading, or maintaining lab sessions. Appointment terms can vary by discipline and institution, and candidates should review role descriptions and time commitments as part of assessing fit.
Research assistantships are commonly linked to externally funded grants and are allocated to projects that require graduate labor. These roles can provide close mentorship with a principal investigator and immerse students in ongoing investigations; compensation and duration are often tied to the grant’s lifecycle. When grants end, departments may seek alternative funding or require the student to transition to other supported forms, so continuity depends on grant renewals and departmental contingency plans.
Fellowships and scholarships usually offer a different balance by emphasizing stipend support with limited or no compulsory teaching duties. They may be awarded by universities, national funding agencies, or private foundations and can support early-stage or advanced doctoral work. Fellowships can carry obligations such as public reporting, specific research aims, or participation in training modules; their competitive nature means selection criteria often emphasize prior achievement, research promise, and proposals that match the funder’s priorities.
Many programs use mixed models that combine assistantship duties with fellowship years or supplement research grants with departmental tuition waivers. This combined approach can distribute workload peaks across the doctoral timeline and provide alternate sources of support if one element lapses. Candidates should consider how different components interact, such as whether teaching obligations conflict with research deadlines or whether fellowship terms restrict outside work or require progress reporting.