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Implementing Domain-Driven Design by Vaughn Vernon

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Measures, Quantifies, or Describes

When you have a true Value Object in your model, whether you realize it or not, it is not a thing in your domain. Instead, it is actually a concept that measures, quantifies, or otherwise describes a thing in the domain. A person has an age. The age is not really a thing but measures or quantifies the number of years the person (thing) has lived. A person has a name. The name is not a thing but describes what the person (thing) is called.

This is closely related to the Conceptual Whole characteristic.

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