IT4IT identifies three lifecycle phases during the journey through the Service Model:
The Conceptual Model
The Logical Model
The Realized Service Model
The Conceptual Model could be described as the “marketing plan” of the service. It represents the beginnings of understanding why you’re offering the service, who the customers are, and when and how you are going to offer it. It is the first thought regarding the service’s costs and benefits.
The Logical Model encompasses the typical models you might use in software development and project management, and the actual creation of the capabilities that the service needs to operate.
In the Realized Service Model, the service may be released or deployed into the operating environment, and staged in the Service Catalog for the customer to subscribe to. It becomes a true physical service.
You can read more about the principles of IT4IT in this article.
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