1 Challenges for Nuclear Reaction Theory The INT Program “Interfaces Between Structure and Reactions for Rare Isotopes and Nu-

Program was to identify specific problems in the area of reaction theory for rare isotopes and propose paths for their solutions. The Program began with an overlap with the 7th ANL/JINA/MSU annual FRIB workshop on “Interfaces between Nuclear Reactions and Structure ” (August 8-12, 2011). The talk-intensive workshop had a large input from exper-imentalists, who were encouraged to formulate charges and challenges to nuclear structure and reaction theory that could both influence and benefit experimental nuclear physics re-search programs. The experimental talks included the topics of one-nucleon transfer and knockout reactions; two-particle transfer, two-particle knockout and two-particle decay; charge-exchange reactions and their connections to nuclear astrophysics; and medium to high energy heavy-ion reactions. The Workshop and Program were successful in illumi-nating the theoretical problems that need to be solved for understanding the rich nuclear landscape from stable to neutron-rich nuclei and their implications for nuclear astrophysics. This report introduces some of the areas discussed and presents some of the specific issues and problems that were raised. Contributors to this report include Alex Brown, Pierr