Expressive writing is an established approach for stress management, and recent practices include information technology. Although mobile interfaces have the potential to support daily stress management practices, interface designs for such mobile expressive writing and their effects on stress relief still lack empirical understanding. To fill the gap, we examined the interface design of mobile expressive writing by investigating the influence of input modalities and visual feedback designs on usability and perceived cathartic effects through in-the-wild studies. While our studies confirmed the stress relief effects of mobile expressive writing, our results offer important insights in interface design. We found keyboard-based text entry more user-friendly and preferred over voice messages due to its privacy friendliness and reflection process. Participants expressed different reasons for preferring different post-writing visual feedback depending on the cause and type of stress. This paper also discusses future research opportunities in interface designs for mobile expressive writing.

翻译：表达性写作是一种成熟的压力管理方法，近期实践已融入信息技术。尽管移动界面具有支持日常压力管理实践的潜力，但针对此类移动表达性写作的界面设计及其对压力缓解的影响仍缺乏实证研究。为填补这一空白，我们通过实地研究，考察了输入模态和视觉反馈设计对可用性及感知宣泄效果的影响，从而探究移动表达性写作的界面设计。尽管我们的研究证实了移动表达性写作的压力缓解效果，但结果在界面设计方面提供了重要启示。我们发现，基于键盘的文本输入因其隐私友好性和反思过程，比语音消息更用户友好且更受青睐。参与者根据压力的成因和类型，对写作后不同视觉反馈的偏好表达了不同理由。本文还探讨了移动表达性写作界面设计的未来研究方向。