The IPCC Sessions are attended by hundreds of officials and experts from relevant ministries, agencies and research institutions from member countries and from Observer Organizations. The Panel works by consensus to decide on the organization’s budget and work programme; the scope and outline of its reports; issues related to principles and procedures of the IPCC; and the structure and mandate of IPCC Working Groups and Task Forces. The Panel also approves and adopts IPCC reports and elects the IPCC Chair and members of the IPCC Bureau and the Task Force Bureau. IPCC Working Groups hold Plenary Sessions to approve the Summary for Policymakers of Assessment and Special Reports, before they are considered by the Panel.