From the observation of reading and summarizing multiple documents, O'Hara et al. reported that paper and pen effectively integrated two different activities of reading and writing 1),8) . When using digital tools, participants in their experiment could perform both reading and writing. However, low manipulability of digital tools using a mouse and a keyboard interfered with smooth integration of reading and writing. They strongly preferred to use paper and pen for annotating when they devoted themselves to active reading.In fact, many digital tools to support active reading provide digital pens to support annotation during reading 9)-15) . Additionally, many commercially available Abstract Handwriting is preferred when people take notes or annotate during listening to lectures or reading documents. This paper proves the effects of handwriting experimentally. Two experiments using a dual task method revealed that the cognitive load of handwriting was smaller than that of typing and typing interfered with memorization more than handwriting. Moreover, this tendency was also observed for people who can type fast with touch typing. This indicates that handwriting has a strong advantage in keeping information without interfering with other cognitive activities regardless of people's typing skill.
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