Observed现场发现: Both people could transmit a choice, yet still had to guess whether the same choice had been understood.双方都能发出信息，却仍需猜测对方是否理解了同一个选择。
Design decision设计决策: Turn every request into one shared order state, echoed through customer-facing visuals and vendor-side visual or haptic feedback.把每次请求转化为唯一的共享订单状态，同时通过顾客侧视觉与摊贩侧视觉或触觉进行回显。
Verify next下一轮验证: Can both people identify the same choice without spoken repair?无需口头补充时，双方能否确认彼此看到的是同一个选择？

Customer chooses顾客选择

Shared order共享订单LIVE同步中

1Food餐品Selected已选择

2Spice辣度Editable可修改

3Confirm确认Matched已匹配

Same state, both sides同一状态，双方可见

Vendor receives摊贩接收

Observed现场发现: Night-market service is nonlinear. Cooking, payment, noise and new customers can interrupt an order at any moment.夜市服务不是直线流程。烹饪、收款、噪声和新顾客都会随时打断点单。
Design decision设计决策: Persist the order state so it can be resumed, corrected or cancelled. Silence is never treated as completion.保留订单状态，使其可以继续、纠正或取消；沉默不再被当作完成。
Verify next下一轮验证: Can both people recover without restarting the entire interaction?发生中断后，双方能否在不重启整段互动的情况下继续？

Attract吸引request发起请求

Choose选择visible state可见状态

Echo回显resume here从这里继续

Confirm确认mutual双方确认

Cook制作state remains状态保留

INTERRUPTION发生中断Payment, noise or another customer enters the flow.收款、噪声或新顾客进入流程。Resume, don't restart继续，而非重来

Observed现场发现: A successful demo can still fail as heat, grease, cleaning, weight and battery replacement accumulate over a shift.一个可用的演示原型，仍可能在热、油污、清洁、重量和换电累积后失效。
Design decision设计决策: Separate the product into replaceable sensing, feedback, power and washable zones. One failed module should not retire the garment.将产品划分为可替换的感知、反馈、供电与可清洗区域；单个模块失效不应淘汰整件围裙。
Verify next下一轮验证: Comfort, cleaning time and module replacement across a full service cycle.验证完整服务周期中的舒适度、清洁时间与模块更换效率。

Display显示wipe clean可擦拭

Sensing感知swap module模块可换

Haptic触觉reposition位置可调

Power供电quick replace快速更换

Shell围裙主体washable可清洗

Detach electronics拆下电子组件Wash the garment清洗围裙主体Replace only what failed只更换失效模块

From one successful order to an entire working shift.从完成一次点单，到支撑一整段服务。

Detect and display能感知