---
alias: introduction-definitions
description: "This document provides a glossary of common terms and definitions used within"
---

# Definitions

The following table provides common definitions used throughout the document:

| Acronym   | Definition |
|----|----|
| **AD** | Active Directory |
| **API** | Application Programming Interface |
| **BOM** | Bill Of Materials |
| **CAS** | Central Authentication Service |
| **DEE** | Dynamic Evaluation Engine - a runtime execution engine based on C# business rules |
| **EDC** | Engineering Data Collection |
| **EFC** | Electronic Failure Catalog |
| **ERP** | Enterprise Resource Planning |
| **MAO** | Maintenance Activity Order |
| **MES** | Manufacturing Execution System |
| **MPI** | Maintenance Plan Instance |
| **MTBF** | Mean Time Between Failures |
| **MTTR** | Mean Time To Repair |
| **Object** | A common type of elements that share the same properties and operations |
| **OCAPS** | Out-Of-Control Action Plan |
| **ODS** | Operational Data Store |
| **OEE** | Overall Equipment Efficiency |
| **OLAP** | Online Analytical Processing |
| **OOS** | Out-Of-Spec |
| **Operation** | An object level method which can be combined in other operations or services |
| **PPH** | Pieces Per Hour |
| **RFC** | Remote Function Call |
| **SPC** | Statistical Process Control |
| **SRE** | Site Reliability Engineer |
| **Transaction** | A service which may involve many objects and that is performed atomically in the database - all or no operations are committed in case of success |
| **UTC** | Coordinated Universal Time |
| **WCF** | Windows Communication Foundation |
| **WIP** | Work In Progress - also referred to as Work In Process |

Table: Definitions