From the Summary: "The Constitution sets forth the general principles which control the procedural aspects of impeachment, vesting the power to impeach in the House of Representatives, while imbuing the Senate with the power to try impeachments. Both the Senate and the House have designed procedures to implement these general principles in dealing with a wide range of impeachment issues. This short report provides a brief overview of the impeachment process, reflecting the roles of both the House and the Senate during the course of an impeachment inquiry and trial."
CRS Report for Congress, 98-806 A
North American Law Center: http://northamericanlawcenter.org/