This paper focuses on the utility of speech input. We proposed some principles of humen-computer interaction, which consist from the basic principles and organization principles of interface that are required for comfortable input systems. Then applying the principles, we discuss the desired organization of interface using speech, mouse and key-board and designed a multimodal drawing tool S-tgif. We also verify the benefits of speech input using the tool. As the results, the multimodal drawing tool with speech recognition reduces average operation time to 82%, the number of command inputs to 89%, and movement of mouse pointer to 53% in evaluation with inexperienced users. It is expected to make speech input more beneficial by applying our guidelines.
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