With distance learning, by the time the probelms students have worked on are corrected and returned, they have forgotten their thought process. This time lag can be bridged by digital ink technology. What is this technology, and what is the system for linking the writing that students do on tablets with greater motivation made possible by digital? Here we introduce the joint research by Zkai and Wacom, which focuses on writing by hand using digital technology and leads to personalized and optimized learning.