> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs-shaunak-branch.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Key Reliability Terms

Before you begin to customize a C3 AI Reliability application, familiarize yourself with these terms used in the context the C3 AI Reliability data model:

* **Alert**: Indicator that a asset risk score has exceeded the configured
  threshold, and notifies the user that a high-risk issue has been identified.
* **Asset**: Manufacturers use the term asset to refer to a revenue-generating
  system of systems (for example, offshore oil platform, gas reservoir).
* **Cluster**: Machine learning term. In Predictive Maintenance, a cluster is a
  correlated group of sensors that are associated with a single asset (but may
  not be physically connected).
* **Failure Mode Identification**: Maps asset event predictions to known
  failure modes observed in historical data or available in database of asset
  classification blueprints.
* **Operations Management**: Directly integrates with work management system to
  schedule work orders.
* **P\&ID**: Piping & instrumentation diagram – detailed diagram of the process
  equipment and piping together with instrumentation and control devices.
* **PFD**: Process flow diagram – high level diagram of equipment relationships
  for material flows in a process.
* **Plant**: A facility where an industrial manufacturing process takes place.
* **Risk Score**: quantitative measure of asset performance using
  semi-supervised anomaly detection. Risk score is computed based on correlation
  of relevant tags/sensors to a given asset, and the deviation from observed behavior
  from the expected behavior for that group of tags.
* **ReliabilityAsset**: A generalized asset that can be broken down into a general
  asset hierachy, usually consisting of an overarching System that has multiple Subsystems
  which have multiple pieces of Equipment.
* **Equipment**: A ReliabilityAsset that is a single piece of equipment (for example,
  valve). Not an actual type, just a formulaic use case of ReliabilityAsset.
* **Subsystem**: A ReliabilityAsset which is a collection of equipment or a
  collection of smaller subsystems performing a chemical reaction or physical operation
  that occurs on the material in the process. Not an actual type, just a formulaic use
  case of ReliabilityAsset.
* **System**: A ReliabilityAsset which is a collection of subsystems performing
  a chemical reaction or physical operation that occurs on the material in the
  manufacturing process. Not an actual type, just a formulaic use case of
  ReliabilityAsset.
* **Sensor/Tag**: An individual data series associated with a measured quantity on
  an asset (for example, pressure, temperature, flow rate). Is a leaf in the asset
  hierarchy and are used as features in Machine Learning models.
* **Workflow Management**: Multi-phase workflow process to review and
  disposition alerts.
* **Criticality**: A generic and consistent attribute assigned to Assets and Alerts, used for comparing and triaging especially when dealing with different non-comparable model outputs.
* **Criticality Score**: A numeric value between 0 and 1 (inclusive) to represent criticality.
* **Criticality Level**: A descriptive string to represent criticality in the UI.