Final answer:
In cleanroom software engineering, a 'box' does encapsulate a system aspect at a specific level of detail, which is true.
Step-by-step explanation:
In cleanroom software engineering, the concept of a "box" does indeed encapsulate some aspect of the system at a particular level of detail, so the answer is 1) True. The box-structured approach is a method in cleanroom engineering that allows for the incremental development of software, with each box representing a specific level of abstraction. This could range from high-level abstract 'black boxes' that define the overall system in terms of inputs and outputs, to 'clear boxes' (also known as white boxes) that detail the internal workings or 'state boxes' that illustrate state transitions within the software.