на основе каких предположений?

[Gennady1]

как перевести такое предложение: На основе каких предположений были получены выводы о .....?

[Rascha]

How did you arrive at this conclusion?

[silly.wizard]

what was the basis for ((conclusion))?
what assumptions were the basis for the conclusion that ...?
based on what assumptions was it concluded that ...?

[Rascha]

вернее, how did you arrive at the conclusion that...
what made you arrive at the conclusion that

[x-z]

Which offers / proposals lead to conclusions on ... ?

[Rascha]

what made you decide that...
what made you conclude that...
унд зо вайтер унд зо форт)))

[Gennady1]

Спасибо всем.

[SAKHstasia]

Если неизвестно кем были сделаны данные выводы сделаны What suggestions | suppositions | assumptions were followed to reach such conclusions?
What was this conclusion supported with / based on?

Если вывод точно сделаны "Им" :

what assumptions did you rely on to draw such conclusions?
What were you guided with to come to such conclusion?

[D-50]

How did you come up with the conclusion ......