Which of the following is NOT a common characteristic of configuration items?

The correct choice indicates that interchangeability without impact is not a common characteristic of configuration items. In the context of systems engineering, configuration items are entities that are designated for management and are comprised of hardware, software, or a combination of both that achieves a defined set of functions.

Defined functionality refers to what a configuration item is supposed to do, establishing clear performance and operational capabilities. This characteristic is essential, as it dictates the purpose and expected outcomes of the item within a system.

Formal control of form, fit, and function means that any changes to a configuration item are rigorously managed to ensure that its design (form), compatibility (fit), and operational performance (function) remain consistent with the defined specifications. This control process is vital to maintaining system integrity throughout its lifecycle.

Unique specification refers to the distinct, documented attributes that each configuration item must fulfill. This ensures that each item can be individually tracked and managed, facilitating changes and updates while maintaining overall system coherence.

Interchangeability without impact may suggest that one configuration item could be swapped with another without affecting the overall system. However, in systems engineering, it is crucial to recognize that making changes, even seemingly minor ones, can have cascading effects throughout the system. Hence, the concept of interchangeability