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产品经理应该先写需求文档还是先画原型？
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江洋@知乎上的回答： 先做模型，再画原型，最后PRD 模型：对产品形态结构的梳理，包括功能模块，逻辑关系，信息架构，业务流程等，可以用脑 图，use case图，业务流程图来表示，根据不同产品，产出物的侧重点不同。但模型很必要，是可以帮助产品经理将一个想法，或
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