Committees in the House and Senate perform the core lawmaking function of the Legislature, and, not surprisingly, a host of House and Senate rules govern their structure and operation — principally House Rule 7 and Senate Rule 2. The structure of the committees is ensconced in each chamber's rules at the beginning of each biennium, whose rules take the form of a concurrent resolution adopted by each respective chamber. Committees are required to inform the public of their work in advance by means of meeting notices, which are required to be provided one week in advance of meetings outside of the 60-day regular session, and two days within the regular session. The speaker and president assign blocks of time during which committees are authorized to meet, otherwise known as the “block calendar.” Amendments to bills under consideration by House committees are generally due by 6:00 p.m. of the day prior to the meeting for members not on the committee; committee members may file amendments at any time. In the Senate, for all members, amendments are due at least 24 hours prior to the meeting time. Amendments in the House are often drafted by committee staff and are available in the published committee meeting packet, while in the Senate, amendments are generally routed through the bill drafting office and available individually on the appropriate bill Web page.