Multi-device use has become a popular pattern of device use in recent years. However, empirical studies pertaining to motivations behind intention to use multiple devices have been limited. The objective of this study focuses on answering an essential question: given that heterogeneous devices are available to users, why do users use multiple devices rather than a single device to complete a task? Both Task-Technology Fit Theory and mental workload paradigm are considered to develop eight hypotheses and build the research framework. A trip-planning scenario was designed and used in the questionnaire to understand the factors that motivate users to use multiple devices. A total of 217 subjects completed the questionnaire. The results show that perceived task fit with multi-device use forms users’ attitudes toward and expected satisfaction with multi-device use. Furthermore, users’ attitudes toward multi-device use trigger their intentions to use multiple devices. Additionally, perceived complexity of multi-device use hinders users from perceiving good task fit with multi-device use. Implications for theory, practice, and future research directions are discussed.

近年来，多设备使用已成为一种流行的设备使用方式。然而，与意图使用多种设备背后的动机有关的实证研究受到了限制。这项研究的目的在于回答一个基本问题：鉴于用户可以使用异构设备，为什么用户要使用多个设备而不是单个设备来完成任务？任务技术适应理论和心理工作量范式都被认为可以发展八个假设并建立研究框架。设计了旅行计划场景并将其用于问卷调查中，以了解促使用户使用多种设备的因素。共有217位受试者完成了问卷。结果表明，适合多设备使用的感知任务形成了用户对多设备使用的态度和预期满意度。此外，用户对多设备使用的态度触发了他们使用多设备的意图。另外，感知到的多设备使用的复杂性阻碍了用户感知适合多设备使用的良好任务。讨论了对理论，实践和未来研究方向的影响。