1.Write charater patten or gesture  2.Preprocessing   - Distance filtering   - Angular filtering   - Dehooking   - Normalization   - Chain Encoding  3.Recognition   - HMM(Hidden Markov Model)   - Dynamic Programming(DTW, Dynamic Time Warping)   - Parametric Approach   - Neural Network  4.Postprocessing   - Dictionary Search   - Natural Language Processing

- PDA, Hendheld PC, WebPAD, Tablet PC, Pen Computer etc. - DeskTop PC (Pen digitizer, Touch panel, electronic Pen, Pen mouse etc.)