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ITU-T Y.1564 is designed to serve as a network service level agreement (SLA) validation tool, ensuring that a service meets its guaranteed performance settings in a controlled test time, to ensure that all services carried by the network meet their SLA objectives at their maximum committed rate, and to perform medium- and long-term service testing, confirming that network elements can properly ...
A service-level agreement can track multiple performance metrics. In this context, these metrics are called service level indicators (SLIs). The target value of a given SLI is called a service-level objective (SLO). In IT-service management, a common case is a call center or service desk. SLAs in such cases usually refer to the following SLIs:
A service-level objective (SLO), as per the O'Reilly Site Reliability Engineering book, is a "target value or range of values for a service level that is measured by an SLI." [1] An SLO is a key element of a service-level agreement (SLA) between a service provider and a customer. SLOs are agreed upon as a means of measuring the performance of ...
An operational-level agreement (OLA) defines interdependent relationships in support of a service-level agreement (SLA). [1] The agreement describes the responsibilities of each internal support group toward other support groups, including the process and timeframe for delivery of their services.
Because, contrary to the variations of the service level, the service level does not only reflect the stockout event but also the amount backordered, it is widely used in industrial practice. Also, by the definitions, comparing service levels we have α ≤ β {\displaystyle \alpha \leq \beta } whenever the probability of zero demand equals 0.
2. Operational level (Question) A set of questions is used to define models of the object of study and then focuses on that object to characterize the assessment or achievement of a specific goal. 3. Quantitative level (Metric) [8] A set of metrics, based on the models, is associated with every question in order to answer it in a measurable way.
In software engineering and development, a software metric is a standard of measure of a degree to which a software system or process possesses some property. [1] [2] Even if a metric is not a measurement (metrics are functions, while measurements are the numbers obtained by the application of metrics), often the two terms are used as synonyms.
A performance indicator or key performance indicator (KPI) is a type of performance measurement. [1] KPIs evaluate the success of an organization or of a particular activity (such as projects, programs, products and other initiatives) in which it engages. [ 2 ]