NASA’s Space Science Enterprise is openly considering all facets of its Mars Exploration Program starting with the 2005 opportunity and carrying through 15 years and beyond. In order to cast a wide net for capturing ideas and potential participants for missions, mission elements, and experiments that fit within the broadly defined scope of this program, NASA is sponsoring a two-and-a-half-day workshop to be held at the Lunar and Planetary Institute (LPI), which is housed in the Center for Advanced Space Studies, 3600 Bay Area Boulevard, Houston, Texas. The dates for this workshop are July 18-20, 2000.