" Your phrases are grammatical, and would be understood. But we don't normally use "functionality" as an actor. ) You could say, "We have improved the functionality/effectiveness of X," but to the best of my knowledge, "we have created a new functionality/effectiveness for X" is not idiomatic.
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MUSCOVITEIs either of the following word combinations correct English?They both strike me as normal within the field of software development, though, as Avangi cautions, they are examples of "tech-talk".
(1) "let's check if the new functionality performs as expected
(2) ".. new functionality behaves as expected"