Ambient Assisted Living (AAL) technologies can play an important role in helping elderly people achieve healthy ageing and maintain their autonomy. The balance quality tester (BQT) is a device for remote assessment of balance quality for older people at risk of falling. It has been validated both from a technical and a clinical perspective. However, for the BQT to be considered as a useful tool for long-term home monitoring of people with balance impairments, two issues are at stake: ease-of-use on a regular basis and trust in the validity of the data acquisition. To ensure this utility, a usage study has been made to understand the needs and values of different stakeholders: elders at risk of falling and their entourage, as well as health professionals. One main insight was the need to redesign the BQT, so as to fit the needs concerning ease-of-use and trust in validity of data acquisition. Using a Human-centred and Participatory Design approach, the redesigning work relates to hardware design, interaction design, interface design, and most of all to standardizing the protocol of stepping-on the BQT. This paper describes the main results, i.e. the design recommendations, and discusses the collaborative and iterative design process, which allowed the successful redesign of the BQT.

环境辅助生活（AAL）技术可以在帮助老年人实现健康老龄化和维持其自主权方面发挥重要作用。平衡质量测试仪（BQT）是一种用于远程评估处于跌倒风险的老年人的平衡质量的设备。它已从技术和临床角度进行了验证。但是，对于将BQT视为对平衡受损者进行长期家庭监控的有用工具而言，有两个问题受到威胁：定期易于使用以及对数据采集有效性的信任。为了确保这种效用，我们进行了一项使用情况研究，以了解不同利益相关者的需求和价值：有跌倒危险的老年人及其随行人员，以及卫生专业人员。一个主要见解是需要重新设计BQT，以适应有关易用性和对数据采集有效性的信任的需求。重新设计工作使用以人为中心的参与式设计方法，涉及硬件设计，交互设计，接口设计，最重要的是标准化踩踏BQT的协议。本文描述了主要结果，即设计建议，并讨论了协作和迭代的设计过程，从而使BQT得以成功进行重新设计。