ISO/IEC 20926:2009规定了应用IFPUG（国际功能点用户组）功能尺寸测量（FSM）方法的一组定义、规则和步骤。 ISO/IEC 20926:2009符合ISO/IEC 14143-1:2007的所有强制性规定。它可以应用于所有功能领域，并且完全可转换为IFPUG分级方法的早期版本。 IFPUG功能点分析师已经确定了不同的交付率（交付一个功能点的小时数），这些交付率与在不同功能领域构建应用程序有关，这些应用程序针对不同的项目规模和软件复杂性进行了校准。 ISO/IEC 20926:2009适用于任何需要测量功能尺寸的人。有该方法经验的人员会发现ISO/IEC 20926:2009是一个有用的参考。

ISO/IEC 20926:2009 specifies the set of definitions, rules and steps for applying the IFPUG (International Function Point Users Group) functional size measurement (FSM) method. ISO/IEC 20926:2009 is conformant with all mandatory provisions of ISO/IEC 14143-1:2007. It can be applied to all functional domains and is fully convertible to prior editions of IFPUG sizing methods. IFPUG function point analysts have identified different delivery rates (hours to deliver a function point) related to building applications in different functional domains calibrated for varying project sizes and software complexities. ISO/IEC 20926:2009 can be applied by anyone requiring a measurement of functional size. Persons experienced with the method will find ISO/IEC 20926:2009 to be a useful reference.