Influential Factors of Vending Machine Interface to Enhance the Interaction Performance

Time-consuming purchases and operation failures could often occur in the utilization of Vending Machines (VMs) due to the violations between human purchase behavior and design interfaces. An unhindered, clear and concise selfservice shopping mood needs to be discovered under the study of human purchase behavior and characteristics of Human- Machine Interaction (HMI) process in order to solve these problems. In this paper, each step of human´s habitual purchase behaviors on VMs were analyzed so that the features of operations were extracted. Thenkey points of psychological load and mistake operation were located by investigating the operation on the screen of VMs and being combined with the found features of purchase behavior so that the HMI process can be optimized. Lastly, experiments were conducted so that a conclusion can be drawn that the improved screen operation procedures did reduce the time of purchase and times of operation failure. This study and the validating framework could not only provide a model to solve the HMI of VM problems, but also lay a foundation for future research on the new way of machine-based sales system.