Teachers' unions always insist they are professional bodies serving the interests of education, not just their members.
How disappointing, therefore, to discover the Post Primary Teachers' Association's secondary principals' council has suggested schools limit the number of pupils admitted to their new "trades academies" so as not to put staffing positions at risk.
Trades academies — technical courses, as they were — have been reintroduced to schools for 15- and 16-year-old students who do not want to take academic subjects much further and can get NCEA credits in subjects of more use to their employment prospects.
The courses are funded from an account for all industry training providers and the funding of schools is reduced accordingly.
The PPTA principals have warned schools that "depending on how many you enrol (in trades academies), the changes would also be likely to reduce the number of salary units, middle management and possibly the number of senior management allowances the school would receive".