Hybrid evaluation method for Korean Character input system in mobile phones

► This study suggests a hybrid model for evaluating the efficiency of character input systems. ► The model is based on the Hick-Hyman law, which suits the features of Korean characters. ► This hybrid model is the most appropriate model for predicting users' performance based on their level of experience. ► This hybrid model can evaluate users' texting behavior appropriately in the case of hand-held input devices.