The Engine has a fixed data structure for key decision factors. Understanding the structure of this data is critical as you must map your business requirements to the concepts in this structure. Each case (for a product where key decision factors have been implemented) will calculate a list of key decision factors when a determination is stored.
Key decision factors can represent a value which changes over time, e.g. a person's income. They can also represent key events that happen once over the lifetime of a case, e.g, a person's date of birth. Once-off key events must be explicitly in a logical fashion that makes sense to a case worker.