This research proposes a learning process model of the flipped classroom to develop research skills by applying the critical inquiry theory to instructional design to develop thinking and find answers and research skills, critical competencies for conducting research. Our flipped-classroom model was constructed with three phases, including pre-class, in-class, and after-class. The research methodology was separated into two stages: The main stage incorporates a literature review to establish the learning process model, while the second stage includes an expert's assessment of the learning model's suitability. Experts strongly agree with this learning model. We intend to use our model to help teachers prepare and conduct learning activities to enhance undergraduate students' research skills.