On certain occasions, the Marshal of the Sejm summons the National Assembly, a joint session of the members of both houses.

Under exceptional circumstances, the constitution endows the National Assembly with great responsibilities and powers, such as to bring the President before the State Tribunal (impeachment).

The two debating halls have designated seats for the deputies, senators and the single Marshal (speaker) of each.

In both chambers, there are two formal sizes of groups: Clubs (Polish: kluby, klub (sg.)

which are the entire party groups of the elected, where none have splintered away or defected to another klub) and circles (Polish: koła, koło (sg.)).