In this video, I am going to give a short introduction to DMN. I shall describe what its capabilities are and why is it important. To fully describe how DMN works will require a much longer video than this one. You can find more details on DMN using the links provided in the description of this video.
Here is a brief description of DMN, by no means comprehensive but sufficient for you to know why it exists and help you understand the demo in the next video.
DMN is an OMD standard. OMG or the Object Management Group is the same organisation that brought you BPMN2, the Business Process Model Notation V2 standard. DMN is to decision modelling what BPMN2 is to business process modelling.
When you create a DMN model, you are creating a DRD or Decision Requirement Diagram. It is a visual representation of your DMN model. FEEL or Friendly Enough Expression Language is used to evaluate expressions eg, in a decision table. It has been said that: If you can use Microsoft Excel formulas, you will have no problem learning and using FEEL. There is a meta model interchange meaning that you can export your model as XML and import your model to another DMN tool.
To make model interchange possible, the DMN specs defines 3 conformance levels ranging from level 1 to 3 where level 3 is the highest.
The DMN Technology Compatibility Kit shows the compatibility and conformance level of DMN products available on the market, Red Hat Decision Manager included.
To learn more, please watch the video: