Having an understanding of the current application system and messages provides a baseline against the future design requirements that can be gauged.
What is a baseline?
A baseline is known to be a kind of imaginary starting point or the option that is often used as a basis of comparison for a thing.
Note that in the above case, when a person has an understanding of the current application system and messages, it gives a baseline against the future design requirements that can be gauged.
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