The Architectural Billings Index rebounded in October, after two straight months of steep losses, gaining 1.1 points for a score of 53.2. The American Institute of Architects, which compiles the index based on surveys sent to 300 mainly commercial architects, says that this indicates fallout from the credit crunch has not worsened. Although the index of new business inquiries slipped 4.2 points to 58.1, its lowest level in 16 months, any score above 50 indicates growth.