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Explaining DMN core elements

Objective

After completing this lesson, you will be able to Explain DMN core elements.

DMN Core Elements

Decision	Input data	Knowledge source
Uses logic to determine an outcome Contains business rules Can be decomposed into sub-decisions and reused	Provides information for decisions Has an associated data type Can be used by different decisions	Prescribes knowledge for decisions Can be a regulation, law, or authoritative source

To model a decision

Steps

Identify decisions or business requirements:
- Objectives
- Questions and answers
Gather decision requirements:
- Information needed to answer the question
- Knowledge sources
- Regulations
- External authorities, for example, government legislators
Break decisions down into sub-decisions.

Our First Decision: Determine How to Eat Dinner

Summary

Decision diagrams answer the following questions in a clear schematic way:

What are the decision requirements?
Are there sub-decisions?
Are internal or external guidelines for decisions needed?
What are the dependencies between decisions and/or input data?

This is an example of a decision diagram. The elements of the diagram will be explained in more detail during the following lessons.

Let's take a look at how to build a decision model in DMN. We'll use the decision example how to eat dinner based on available budget and motivation. Watch the video below to see how it's done.

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