使用者體驗在行動應用 app 開發中扮演相當重要的角色。欲達到較佳的使 用者體驗，設計師常利用原型進行測試以收集使用者回饋，並根據回饋改善原 型再進行多次測試，反覆更迭的過程稱之為迭代設計。本創作分析整理迭代設 計流程中設計師常用之工具，發現從低擬真至高擬真之原型發展階段雖有不同 的工具，卻需要設計師花費許多時間在軟體操作上，無法讓設計師流暢且快速 地將腦中思考的設計繪製為數位版本，再者，各階段所使用之工具彼此並不相 容，設計師也需耗費額外的成本轉換各階段的產出。
本創作提出一套提升原型建置速度，促進迭代過程的線稿式原型設計 工具「Xketch+」。在原型設計階段，設計師可利用紙面原型的繪製經驗，以繪 製筆劃指令生成元件並設定頁面、元件間的互動行為。此外，本創作導入行動 介面設計模式，設計師能利用已具備共識的之介面設計模式做為範本，進行自 定義修改，滿足設計任務，快速完成原型製作，儘早進入測試及修正的流程， 提升原型迭代速度，設計出更符合使用者需求的行動應用程式。

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