Abstract: Human-computer interaction is developing towards building cognitive systems in order to provide natural and effective interaction experience.By relying on data processing and data fusion algorithms from various sensors,cognitive systems can dynamically adapt to external environment to improve human-computer interaction experience.This paper proposed a natural way of human-computer interaction based on gesture operations in order to cater for particular kinds of usage scenarios of a computer-aided requirements engineering (CARE) tool,which makes further improvement on an existing problem-oriented CARE tool,under the principle and theory of human-computer interactions.A tracing method assisted by multi-modal techniques is applied in the gesture recognition process,which makes significant enhancement to the speed and accuracy of tracing and recognition,thus providing better user experience.

Key words: Human-computer interaction,Multi-modal interaction technology,Gesture recognition,Computer-aided requirements engineering(CARE),Problem frames(PF)