Each year the activities of the Parliament cycle between committee weeks where reports are discussed in committees and interparliamentary delegations meet, political group weeks for members to discuss work within their political groups and session weeks where members spend 3½ days in Strasbourg for part-sessions. In addition six 2-day part-sessions are organised in Brussels throughout the year. Four weeks are allocated as constituency week to allow members to do exclusively constituency work. Finally there are no meetings planned during the summer weeks. The Parliament has the power to meet without being convened by another authority. Its meetings are partly controlled by the treaties but are otherwise up to Parliament according to its own "Rules of Procedure" (the regulations governing the parliament).