Personas reduce the need for elaborate diagrammatic models; it's easier to understand the many nuances of user behavior through the narrative structures that personas employ.
人物角色减少了对详细图形模型的需求，通过人物角色使用的叙述结构，能够更容易理解用户行为的很多细微差别。
The change of user models are explained, from model of using tools, to model of technical operations, then to model of user psychology and behavior.
解释从简单工具型的用户模型，到技术操作型的用户模型，再到符合人类心理与行为的用户模型的变化。
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