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A prime example of a business rule is a rule that has a boolean as result. Let's say that any applicant can request a certain insurance, and all women receive a discount. In this particular case, a default constant value for Discount is set to False and a business rule can be created that overwrites this attribute to true whenever the applicant is female:
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Decision table
A decision table is used best when the possible outcome of the logic is one of many values. Let's say that when applying for a certain loan, a risk category is determined. Based upon applicant characteristics such as recurrenc and a calculated risk score, the risk category is either verylow, low, medium, high or decline.
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Default value expression
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.
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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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