Mr Tierney visited more than 100 schools and found strong parental support and high pupil motivation. "Pupils enjoyed their language experience - the games, songs, the stories - and were developing a positive attitude towards language learning," he says.
Mr Tierney, a Strathclyde University lecturer and prominent member of the language teachers' association, believes the greatest danger to the initiative lies in the primary-secondary transition.
"I do not get the impression that there is a clear strategy to ensure that the secondary schools are able to build on what has been achieved in primary schools," he said.
* Warning bells for languages: Dan Tierney writes next week in The TES Scotland.