In reference of system design, User interface and user centered design please give detailed explanation

In reference of system design, User interface and user centered design please give detailed explanation .
Most systems which are designed are have focused on systems accessible by large populations. For this discussion board research and contemplate systems built for experts (engineers, artists, stock traders, etc.). What special considerations should be made for these users? Or, should systems for these users simply adhere to the best practices for all other users? Share your educated opinion and justify it.

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