Hi,
are first assigned to one of the 18 different question group or condition
At random?
In this case you should consider a different approach.
First check by the demographic questions into which of your 29 quota groups the participant is.
THEN select the least filled group of the 18.
Then there is this thread about a similar question a few days ago.
[url]
forums.limesurvey.org/forum/can-i-do-thi...add-quotas-massively
[/url]
I would do it like Denis.
There are only three tables in the database involved.
If there is more time I'll try to show an example.
Joffm
P.S.
As usual the best, you show a prototype of the survey as lss export.
AS you said, you already finished the quota of one group.
Maybe we find a better way.