Which of the following statements does not apply to a building block?

A building block in the context of TOGAF is fundamentally a modular component that encapsulates specific functionality, aimed at addressing particular business needs. By definition, building blocks are designed to be reusable and serve as the foundation for constructing larger architectural solutions.

The first three statements resonate well with established principles of building blocks. They highlight the fundamental characteristics that make a component flexible, accessible, and integratable into broader systems. These aspects ensure that each building block can be utilized across different projects and scenarios, promoting efficiency and consistency within the architecture.

The statement regarding the tight coupling of a specification to its implementation, on the other hand, runs counter to the principles of what constitutes a building block. It implies a lack of flexibility and portability, as tightly coupled specifications tend to be specific to certain technologies or implementations, diminishing the capability of the block to function in various contexts or alongside other blocks. High cohesion and low coupling are key architectural goals, and a building block that is tightly coupled would jeopardize these principles, which is why this statement does not accurately reflect the nature of building blocks in an effective architecture.