Which statement does not apply to a building block?

The statement highlighting that a building block has a specification that is tightly coupled to its implementation does not accurately reflect the nature of building blocks within the TOGAF framework.

In TOGAF, building blocks are designed to be modular and reusable components that can meet specific business needs. They are characterized by their ability to interact with other building blocks, allowing for interoperability, which is an essential aspect of enterprise architecture. Additionally, building blocks are defined by their published interfaces, making access to their functionality straightforward and standardized.

The emphasis on loose coupling rather than tight coupling in a building block's specification allows for flexibility and easier maintenance or updates. This design principle supports the overall adaptability of the architecture, enabling organizations to respond to changing business requirements or technological advancements without disrupting the entire system. This flexibility is a fundamental concept in enterprise architecture, promoting a sustainable and efficient design approach.