A "toxic" combination of curriculum change and budget cuts is putting teachers under increasing pressure, union leaders have warned.
The Educational Institute of Scotland (EIS) claimed some of its members were now at "breaking point".
Union leaders spoke out on the issue as a new campaign aimed at reducing teachers' workload got under way.
The EIS hopes to reduce "unnecessary" administrative pressures on teaching staff in all school sectors.
Hugh Donnelly, secretary of the EIS Glasgow local association, spoke ahead of the campaign's first event.