Conference proceedings includes 13 papers on design and economics of composite open web steel joists; influence of design criteria on selection of structural systems for tall buildings; thin walled compression members; design of steel beam-columns; plastic behavior of hollow structural sections; developments in structural steel standardization; design, fabrication and erection of the Papineau-Leblanc Bridge; fatigue strength of welded steel beam details and design considerations; structural fire protection; and evolution of steel bridge design in Canada. Following is a listing of the papers presented: Design and Economics of Composite Open Web Steel Joists. By A. H. Atkinson and J. A. Cran. Influence of Design Criteria on Selection of Structural Systems for Tall Buildings. By Fazlur R. Khan. Thin Walled Compression Members. By K. R. Venkataramaiah and N. C. Lind. Design of Steel Beam-Columns. By P. F. Adams. Plastic Behaviour of Hollow Structural Sections with Implications for Design. By R. M. Korol. Developments in Structural Steel Standardization. By W. C. Kimball. Design, Fabrication and Erection of the Papineau-Leblanc Bridge. By P. R. Taylor and J. G. Demers. Fatigue Strength of Welded Steel Beam Details and Design Considerations. By J. W. Fisher. Design of an Industrial Boiler Building. By K. A. Strauss and A. Orr.