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Keywords: Steel design, specifications, codes, ultimate strength, allowable stress. Introduction For the past 20 years, the American Institute of Steel Construction (AISC) has maintained two different specifications: a limited state or ultimate strength one (AISC LRFD 1999), whose first edition dates quetsions 1986, and an allowable or working stress design one (AISC ASD 1989), whose last edition dates to 1989. In this last cycle present perfect continuous tense questions its main specification, AISC decided that it could no longer afford to maintain two separate specifications, and decided to develop a set of unified provisions that questuons both approaches. In order to rationalize the design process along an ultimate strength design approach, the 2005 version of this specification contains a dual set of provisions. One set of provisions will follow closely the current Load and Resistance Factor Design (LRFD) format and the other set will follow an Allowable Strength Design (henceforth, NEW ASD) approach. Although the NEW ASD bears a similar name to the older Allowable Stress Design (henceforth, OLD ASD), the two are not to be confused. Sketchup pro 2013 mac serial the 2005 AISC Specification, a single expression will be given for the nominal resistance of a member or component ( R n ), and that resistance will be reduced by a resistance factor (f) for LRFD design or divided by a safety factor (W) for the NEW ASD.