The objective of this publication is to present a practical guide to the design of structural steel elements for buildings. The document comprises three principal Sections: general guidance, design data, and design tables. The guidance is in accordance with BS 5950-1:2000, Structural use of steelwork in building – Code of practice for design. Rolled and welded section. Worked examples are presented where appropriate. No attempt has been made to consider complete structures, and it is to be noted therefore that certain important design matters are not dealt with – those for instance of overall stability, of interaction between components, and of the overall analysis of a building. Section on General Design Data includes bending moment diagrams, shear force diagrams and expressions for deflection calculations. A variety of beams and cantilevers with different loading and support conditions are covered. Expressions for properties of geometrical figures are also given, together with useful mathematical solutions and metric conversion factors. The design tables also include section property, member capacity and ultimate load tables calculated according to BS 5950-1:2000. The tables are preceded by a comprehensive set of explanatory notes. Section ranges listed are those that were readily available at the time of printing. In addition, both hot finished and cold formed structural hollow sections are included in the ‘Tables of Dimensions and Section Properties’. A list of references is given at the end of the branding explanation pages. Foreword to the 4th edition. This edition has only been modified to include the new range of sections. It provides the Advance, Celsius and Hybox branding in addition to the BS section designations. The relationship between the branded sections/steel grades and the BS sections/steel grades is given in section 11 of the explanatory notes.