The objective of this Workshop is to examine all possible methods that could be used to detect and characterize Earth-like exoplanets using space missions that are less costly than a full-scale "flagship" mission. The rationale for considering small- and mid-scale missions is two-fold:

• It is possible that future observations will show that a relatively large fraction of Sun-like stars have terrestrial planets around them in habitable-zone orbits.

• It is certain that the cost of future astrophysics missions will be an important constraint in selecting Navigator Missions.

Given these two factors, which combined would create a planning environment quite different from that of only a few years ago, it is possible that we could use small- to mid-scale missions to carry out the President's request to NASA in the Vision for Space Exploration to detect and characterize Earth-like planets.

This Workshop will feature contributed presentations and extended discussions of techniques and expected scientific return, for all types of space missions for exoplanets, but focusing on the lower-cost options. Specifically, we will consider what could be accomplished with two classes of missions:

• Mid-scale missions, with development costs under ~ $2 B
• Small-scale ("probe") missions, development costs under ~ $1 B

Our emphasis will be on finding what can be done with small and mid-scale missions. For perspective we will also examine other relevant missions that have already received much study, including Corot, Kepler, SIM, and TPF.