Controversial education standards designed to measure pupils' achievement often fail to identify areas where students need particular help, local principals warn.
The latest National Standards results - for the 2012 school year - were released by the Government this week.
Masterton's Lakeview School principal Ed Hodgkinson, who is also president of the Wellington Regional Primary Principals' Association, cautioned against using the data as an absolute measure for progress.
"As a general picture, they show us where we're at. [But], you can't read a lot into these results. We're still trying to get our heads around it and work out what we're doing."
Publication of the data, which show whether New Zealand children are reaching expected reading, writing and mathematics standards, has renewed debate around the controversial system. Aggregate results, which provide a national snapshot of last year's achievement levels, show a slight improvement on 2011.