Which practice is necessary for modifying systems to ensure compatibility with other systems?

Which practice is necessary for modifying systems to ensure compatibility with other systems?

• A. Producible
• B. Unstable requirements
• C. Alternative Dispute Resolution (ADR)
• D. Define and control interfaces

Answer: (D)

When different systems must work together, how they interact is what enables compatibility. Defining interfaces means specifying exactly how data is exchanged, what messages or API calls look like, what data formats are used, and what the timing and semantics of interactions are. Controlling interfaces adds a formal approach to change: documenting them in an interface control document, enforcing versioning, and ensuring any modification is coordinated so other systems can adapt. This contract-based approach reduces surprises, enables independent development and testing, and helps maintain backward compatibility as systems evolve. Without well-defined and managed interfaces, changes in one system can break others or create inconsistent data and behavior. The other options don’t address interoperability directly: providing something as producible is not about integration, unstable requirements undermine compatibility, and ADR handles conflict resolution rather than technical interface management.

When different systems must work together, how they interact is what enables compatibility. Defining interfaces means specifying exactly how data is exchanged, what messages or API calls look like, what data formats are used, and what the timing and semantics of interactions are. Controlling interfaces adds a formal approach to change: documenting them in an interface control document, enforcing versioning, and ensuring any modification is coordinated so other systems can adapt. This contract-based approach reduces surprises, enables independent development and testing, and helps maintain backward compatibility as systems evolve. Without well-defined and managed interfaces, changes in one system can break others or create inconsistent data and behavior. The other options don’t address interoperability directly: providing something as producible is not about integration, unstable requirements undermine compatibility, and ADR handles conflict resolution rather than technical interface management.