PsyGuy - Thank you for the leads. I was unfamiliar with municipal ISs.

Sid - Got it. Wary I be. Is there a term for such 'bilingual' programs?

Thank you or the response.

I am more interested in the general state of developmental, two-way or dual programs and what percentage of schools would be running these programs. Any guess?

Not specific about language other than English being one of them.

Thank you for the reply. Could you please provide a source for information about schools using these programs? I am interested in learning more about schools that use these programs.

Are there international schools that are using a developmental, two-way, or dual language set-up? Not segregated bilingual where the classes in English are taught via English-only submersion or mother tongue programs that are after school or off on the peripheral edge.