I do not wish to go into more details than what I said :)
I totally understand all the risk elimination processes you use
(pre-evaluation, targeted selection, etc.) and I have no criticism towards
that.
You (Sophie, Tom) both have a seemingly well working educational
programme(s) (or at least seems so) reaching out to multiple educational
facilities in your countries. Think about reaching out to "lower levels"
(none of the Wikipedias are edited by "quality people only" as of now or
ever).
(Btw I would be really interested in the "keeping ratio" - how many
students became regular editors from the masses you've reached - 1/8? 2/37?
1/100? 3/2637?)
Balázs