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Jared Spool defines a model of core users (who have domain knowledge) and ring users (without domain knowledge):


Perhaps the OP developed a core competency in project management, which requires a different app. Spool implies that it is hard to have an app that can meet the needs of both core and ring users, since they have different needs.

It's not novice vs expert in the app that matters, but novice vs expert in the domain area.

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