Acting principal Greg Lees said as pupils ranged in age from 5 to 13, teachers were informing them of the incident at the appropriate level and educating them about keeping themselves safe.
"The senior staff decided that the best thing to do was to inform all the teachers of the facts and they would address their own classes,'' Mr Lees said.
The decision was made so as not to "alarm or frighten'' any children, he said.
Concerned parents had been in contact with the school "wanting to know more'' about the incident but Mr Lees said he was unable to offer them any more than had been emailed to parents after the incident.
He had not had any formal contact with police since Friday's incident.
In an email yesterday, a police media spokeswoman said police were investigating and would continue their presence in the area in the coming days.
An email sent to parents from the school on Friday alerted them to a man who approached a pupil and made "a comment of a sexual nature''. The email advised them to be vigilant.
In a statement on Saturday, police asked for the public's help to identify a man "who made inappropriate comments'' to a pupil.
Police described him as a clean-shaven Caucasian with dark hair, shaved at the sides, aged 20 to 30.
The car he was driving was a light-blue four-door hatchback with black seats or seat covers and it appeared the windows were wind-up, not electric, the statement said.
Dunedin police (03) 471-4800, Crimestoppers 0800 555-111.
