http://www.gpoaccess.gov/riddick/449-493.pdf

The above URL describes the process.

In the end, the committee report proposes legislative language, most often as an amendment to the the Senate Bill or House Resolution (whichever is easier). The report goes directly to both houses of congress for vote.

Bottom line is that the language has to be agreed by both houses. If after committee the measure fails to pass in either house, it usually is dead for the rest of the term.