What is Orthogonality? (Thanks to Andrew Hunt and David Thomas for coining this term in connection with Programming)
When we move parallel to X-axis, no change on Y-axis. In other words, the two lines are independent. In software development, or computing in general, this can be called decoupling. I should be able to change one thing without affecting the other thing.
For example, I should be able to change the UI without having to change the database; or I should be able to change one concrete class without having to change another concrete class.
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