External teacher / Adjunct instructor

An external teacher (or adjunct, visiting professor, expert depending on the context) is a teacher whose contractual relationship with the school is temporary or occasional. From the solver's point of view, an external teacher is a teacher like any other — same availability, same assignments.

The distinction is mainly administrative:

• a short contract (by the hour, by the lesson, by the assignment),
• a smaller volume of hours than permanent teachers,
• a user often not hosted on the same systems as permanent teachers (different e-mail, no access to the same internal tools).

Dedicated display

A icon distinguishes external teachers from permanent ones on some screens (notably the lesson tooltip and the list view of timetables). On the main time grid, the default display makes no distinction for space reasons, but the information remains visible in the tooltip on hover.

Special case: a visiting professor for a few lessons

For a one-off lesson where a visiting professor co-teaches with the main teacher without alternating, see co-teaching. For a weekly alternation of two teachers on the same time slot, see alternate lessons.