Usability requirements

Concert's foundational library for assessing resilience includes a category of non-functional requirements library for usability ensures that applications deliver reliable, intuitive, and responsive user experiences under varying conditions. Usability requirements define measurable targets for latency, error handling, and disruption resilience to maintain good user experience.

You can improve your resilience posture by aligning user expectations into measurable service level objectives (SLOs), implementing blast radius controls, and refining error rate monitoring.

• Latency SLO

  This requirements establishes quantifiable metrics for user experience by measuring service response times to user interactions. By precisely defining latency measurement methodologies and establishing context-specific performance thresholds, the system can consistently deliver responsiveness that meets or exceeds user expectations across all critical workflows.

• Error rate SLO

  This requirements measures the frequency of exceptions and failures occurring during system use. High error rates indicate disruptions that degrade user experience and signal potential reliability issues.

• Blast radius managment

  This requirements evaluates how well a service contains the spread of disruptions by using resilience strategies such as throttling or circuit breakers.

Each requirement requires you to provide several metrics, which are measurements used to assess the application's posture with that requirement. Some metrics are human-entered, whereas others can be ingested automatically from connected systems.