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The question is whether the indefinite article an before "increased emphasis" is needed.

During system design, there is increased emphasis on interface-based design.

During system design, there is an increased emphasis on interface-based design.

Are both sentences correct?

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Both versions are fine - they mean exactly the same, and are about equally common..

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Note that if we replace emphasis on interface-based design with, say, tendency to focus on the interface, we need the article. It's also much more likely to be included if we discard the (arguably redundant) word increased, so it's probably easiest to always use an in such constructions.

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