The AIA reported the March Architectural Billing Index (ABI) score was 50.4, following a mark of 51.0 in February. This score reflects a slight increase in demand for design services (any score above 50 indicates an increase in billings). The new projects inquiry index was 56.6, down from mark of 63.4 the previous month. The commercial sector continues to lead the ABI which has remained in positive territory for the fifth consecutive month. As a leading economic indicator of construction activity, the ABI reflects the approximate nine to twelve month lag time between architecture billings and construction spending.