Proceedings include 23 papers that cover the state of the art in the area of deflection calculations; the treatment of deflection evaluation in a number of codes; the subjects of one-way floor systems, two-way slab systems, and prestressed concrete flexural members; and a wide range of deflection related subjects and ranged from simple calculation methods to highly complete analysis procedures. The last item in the volume is an annotated bibliography that has been collected by the members of ACI Committee 435. Following is a list of the titles and authors of the papers presented: Code Criteria for Deflection Limitation in Reinforced Concrete Structures. By B. L. Meyers and G. M. Sabnis. Computation of Deflections for Beams and One-Way Slabs. By C. G. Salmon, A. Fattah Shaikh and M. Saeed Mirza. Deflection of Two-Way Reinforced Concrete Floor Systems, State- of-the-Art. By ACI Committee 435. Deformation of Noncomposite and Composite Prestressed Concrete Members. By D. E. Branson. Deflections-Problems and Treatment in Various Countries. By C. V. Clarke, A. M. Neville and W. Houghton-Evans. Computer Analysis of Deflection of Statically Indeterminate Concrete Structures. by R. G. Drysdale and M. Saeed Mirza. Simplified Deflection Computations. By R. S. Fling. Short Term Deformation of Reinforced Concrete Beams. By B. Johnson. Analysis of Deformations in Structural Concrete Flexural Members. By S. K. Ghosh and C. S. Chandrasekhar.