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Content: After being introduced, a bill is referred to the appropriate committee for review. There are 17 Senate committees, with 70 subcommittees, and 23 House committees, with 104 subcommittees. The committees are not set in stone, but change in number and form with each new Congress as required for the efficient consideration of legislation. Each committee oversees a specific policy area, and the subcommittees take on more specialized policy areas. For example, the House Committee on Ways and Means includes subcommittees on Social Security and Trade. A bill is first considered in a subcommittee, where it may be accepted, amended, or rejected entirely. If the members of the subcommittee agree to move a bill forward, it is reported to the full committee, where the process is repeated again. Throughout this stage of the process, the committees and subcommittees call hearings to investigate the merits and flaws of the bill. They invite experts, advocates, and opponents to appear before the committee and provide testimony, and can compel people to appear using subpoena power if necessary. If the full committee votes to approve the bill, it is reported to the floor of the House or Senate, and the majority party leadership decides when to place the bill on the calendar for consideration.