The ASP makes a number of important decisions that are central to the Court's work. It decides on the Court's budget and measures to enhance cooperation and the universality of the Rome Statute. It also decides on amendments to the Rome Statute and the Rules of Procedure and Evidence. Another crucial function of the ASP is to elect the Court's judges and prosecutor.

More on the ASP 

Elections
The Assembly also elects the representatives on various subsidiary committees, such as the Committee on Budget and Finance (CBF) and the Advisory Committee on the Nominations of Judge (ACN). Independent bodies like the CBF and ACN make recommendations to help inform the ASP decision-making process.

Bureau of the Assembly of States Parties
The ASP has a Bureau, consisting of a president, two vice presidents, and 18 members elected by the assembly for a three-year term. The Bureau assists the assembly in the discharge of its mandate and meets regularly throughout the year in New York and The Hague. The Bureau has two working groups: the New York Working Group (NYWG) and the Hague Working Group (HWG).  

Secretariat of the Assembly of States Parties
The ASP has a permanent secretariat to assist the Assembly, the Bureau, and other subsidiary committees in carrying out their work. The ASP Secretariat is located in The Hague.

Working Groups.
Consultations between states and Court officials take place through working groups, which cover various topics essential to the work and governance of the ICC. The topics are divided between the Working Group on Amendments (WGA), the New York Working Group of the Bureau (NYWG), and The Hague Working Group of the Bureau (HWG). Civil society may participate in the meetings of these working groups.