Activities order when planning ?

Hello,

How does ProjeQtOr order the activities when planning ?

First I had thought by "priority" then by "WBS", but it seems to me the "id" (that is, the order of creation of the activity) is also taken into account (not sure) ? Predecessors and successors must also be taken into account.

I have some doubts : can you tell me which elements are taken into account and in which order ?

(Sorry for the question, but I did not find the documentation about it)

Thank you !