Abstract. As mobile devices are getting powerful, reliable, and inexpensive, more and more personal services have been introduced to individuals via their mobile devices. These services enable users to perform a broad range of activities at any time and anywhere. While a lot of research and development effort has been focusing on extending the scope of activities that can be carried out on mobile devices, little attempt has been made to provide process-oriented services. In this paper, we propose a model for specifying and querying personal processes. This model is equipped with a set of operations that allow mobile users to express queries on their personal processes. Answers of these queries will help mobile users in planning their activities while they are on the move. We have designed and implemented a prototyped personal workflow system on Palm Pilot PDA based on the proposed model. Experiences with this implementation are provided.