Discussion
Assertion (A): Interfaces between systems are documented formally even within one company.
Reason (R): An undefined interface allows two teams to make incompatible assumptions.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. Two teams working either side of an undefined boundary will each assume something reasonable, and the assumptions will differ - in the loads carried, the data format, the power available, the space envelope, the units. The mismatch is discovered at integration, which is the most expensive place to find it. A formal interface document fixes the boundary so both sides can proceed in parallel with confidence.
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