The Decision Modelling and Notation (DMN) is an OMG standard for modelling and execution of decision services, either standalone or integrated with Business Processes using BPMN (Business Process Model and Notation, its sibling standard). DMN defines a higher level graphical notation for decision services (Decision Requirements Diagram) and user friendly notation for decisions with support for Decision Tables and a high level expression language called FEEL. It also defines a meta model and runtime semantics that allow the model to be fully executed, without the need for any mapping or intermediate model. During this presentation, attendees will learn what DMN is and how to use it to create decision services for real world use cases. This includes an overview of the Decision Requirements Diagram, Decision Tables, Boxed expressions, among other features. Attendees will also learn about how the Red Hat BRMS product supports the specification, and how to use it to provision their services in the cloud.