1.20.10 | Washington, DC | The Architecture Billings Index moved slightly higher last month, although the index remained below 50 for the 23rd consecutive month. The score in December was 43.4 compared with 42.8 in November. The December reading indicates a continued decline in demand for design services. Any reading above 50 indicates an increase in billings. The index is derived from a monthly survey of architectural firms by the American Institute of Architects. http://www.aia.org/press/AIAB082127