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A default value, combined with an expression is used most often when the outcome of the logic is determined/calculated by some sort of formula. In most cases, the result will be a number, date or constructed string. See an example below, where the required monthly installment is determined by a formula containing - amongst others - monthly interest and monthly fee.
Data rule
Whenever the source of the logic is a (large) set of data, that is preferrably maintained and managed outside of the boundaries of the Blueriq model, a data rule might be used. Whenever the source is not part of the business model but a third party, data rules are used best. A prime example is used in Dutch addresses, where a zipcode combined with a house number will result in a streetname and a city. Most likely the model will not hold all that information in business rules or decision tables, but a data rule can be constructed that will gather the correct data, based on the given zipcode and house number.
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