In human-computer interaction (HCI), advances of information and communication technology have led to a wealth of Persuasive Technology (PT) researches to support people’s behaviors change. Many PT theories have been widely used for design analysis and are supposed to be useful for PT design. However, very limited effort has been taken to bridge the gap between PT theory and design practice. In this paper, we present the formative study of Perswedo, a card-based tool that introduces persuasive principles from Persuasive Systems Design model to support the creative design flow. As an intermediate step to appropriate Perswedo cards to the design activities, we assessed the usefulness and value of Perswedo in the design process as well as the design implications of the cards through three design workshops. Our findings suggest further study to resonate PT theoretical work with design practice.