Each kind of initiative follows its own path through Congress. Pick one to see its steps, explained one by one.
After an interpellation to the Government, a group asks for a specific stance. Does not change the law.
Not binding: it states a position or asks the Government for something it is not obliged to do.
A group questions the Government in the plenary about its policy on a specific issue, and a minister answers.
The following week, the same group tables a motion setting out what it asks of the Government on that issue.
It is debated in the plenary. The other groups can table amendments and the proposing group decides whether to accept them.
It is voted on, sometimes point by point. If it passes, it is Congress's position, but it changes no law and the Government is not bound by it.