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Perception-Behavior Engineering, an integrated human factors methodology, is proposed to integrate more systematically user perceptions and behavior-related information into design. The major merits of this approach are: 1) elicitation of perceptions and behaviors that are strongly related to design improvement; 2) establishment of the interrelationships between perceptions, behaviors, and design attributes; and 3) explicit application of these relationships while designing a product. First, the 4-phase process (i.e., perception spanning, behavior spanning, matching, and design/evaluation) that constitutes Perception-Behavior Engineering will be presented, and then comparisons will be made with existing methods such as Sensibility (Kansei) Engineering and Human Factors Engineering. In order to verify its practicality, the proposed process was applied to the driver workspace and interface design