>[!abstract] >The Robustness Principle, also known as Postel's Law, comes from computer networking and advises: "*Be conservative in what you send, be liberal in what you accept*". It was originally formulated in the design of TCP/IP protocols, encouraging systems to produce outputs that strictly follow standards while tolerating minor deviations in inputs to maximize interoperability. The principle aims to enhance robustness in heterogeneous networks, allowing diverse implementations to communicate smoothly. However, critics note that excessive leniency can entrench noncompliant behavior and create long-term fragility, so the principle illustrates both the value and the risks of permissive design. >[!note] >This concept has obvious applications outside of computer science, and in everyday relationships in particular, in the sense of being exigent with oneself and tolerant of others. Interoperability applies to humans just as much as networked computers. >[!related] >- **North** (upstream): — >- **West** (similar): [[Hang on tightly, let go lightly]] >- **East** (different): — >- **South** (downstream): [[Interoperability]]