Glossary Of Terms

The SGIA Glossary of Terms serves as an excellent industry terminology resource. It is the language by which we all communicate, without it universal understanding would be impossible. Language and our ideas about how it is interpreted change rapidly. SGIA is aware of this and continues its effort to keep our constituents well informed about changes to the increasingly complex industry terminology. The definitions are for general reference only. Usage may vary between companies, individuals, or national and country customs. The information presented is as accurate as the authors and editors can ascertain and SGIA assumes no responsibility for the use of information presented herein.


  • Ultimate elongation
    The maximum distance a material will stretch in a lengthwise direction before breaking, expressed as a percent of the original (unstretched) length.
  • Upper capability performance (CPU)
    A measure of the relationship between the performance of a process and the upper specification limit.