Non-tenure-track faculty are found among the lowest paid and lowest in total earnings of full-time faculty. No survey exists of the stipend paid per course, but the basic academic salary of part-time faculty members is $6,302 of a total income from all sources of $34,275.
Then, promotion to the rank of Associate Professor and later Professor (informally, "Full Professor") indicates that significant work has been done in research, teaching, community service, etc.; in some institutions the associate level indicates that a tenure-track professor has been granted tenure.
Less than 5 percent of faculty who are part time are on the tenure track. Seventy-nine percent are classified below assistant professor, for example, instructor, lecturer, or reader. About 90 percent of all full-time lecturers and nearly 50 percent of all full-time instructors are non-tenure-track faculty.