The Performance ABE is an addition to the SID model’s Common Business Entities domain.  It represents a generalization of attributes and relationships that are common to both the SID Service Performance and Resource Performance ABEs’ entities, such as performance indicators, thresholds, and consequences.  Resource performance entities is collected hop by hop (between two network elements), while service performance is an aggregation of multiple resource performance instances that constitute the path a service takes through a network.<br/>Two key entities that comprise the Performance ABE are PerformanceSpecification and Performance.  They represent an application of the SID EntitySpecification/Entity pattern.  A PerformanceSpecification and its related specification entities provide the definition of the performance attributes, such as KPIs, dimensions, and performance thresholds.  The Performance entity and its related entities provide the values associated with the manner in which a service or resource is performing or has performed, such as the loss of 5K packets between two network elements.<br/>Following Figure depicts the PerformanceSpecification and Performance entities along with the two types, or subclasses, of performance-related entities relevant to the model, ServicePerformanceSpec and ResourcePeformanceSpec, along with their related instance entities, ServicePerformance and ResourcePerformance.<br/>