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Jakob Nielsen defines the OOUI in contrast to function-oriented interfaces: "Object-oriented interfaces are sometimes described as turning the application inside-out as compared to function-oriented interfaces. The main focus of the interaction changes to become the users' data and other information objects that are typically represented graphically on the screen as icons or in windows."cite-ref-nielsen-1-0[1]

Dave Collins defines an OOUI as demonstrating three characteristics:

• Users perceive and act on objects

• Users can classify objects based on how they behave

• In the context of what users are trying to do, all the user interface objects fit together into a coherent overall representationcite-ref-collins-2-0[2]

Jef Raskin suggests that the most important characteristic of an OOUI is that it adopts a 'noun-verb', rather than a 'verb-noun' style of interaction, and that this has several advantages in terms of usability.cite-ref-raskin-3-0[3]

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