Interface wireframes are much faster to edit than near-final interface mockups. There shouldn't be a drop of appearance in interface wireframes, which allows you to sharpen functionality without getting distracted by indents, colors, rounding, and so on.
Such interface wireframes become a development plan for the whole interface and can be useful for developers who will have to build and code this interface. Even before the whole interface is ready, you can start working in parallel and reduce the development time of the whole project.
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