**3. Collaborative, social-networked posture training**

This research adopts the direct biofeedback learning mechanism that the individual gains control of the head and neck posture after receiving the biofeedback. Our biofeedback sensing and filtering device monitors real-time head/neck and lumbar posture and determines head craning forward or hanging downward as well as the forward low back. Using the biofeedback process with sound, light, or vibration, people receive alert and warning when their head/ neck or lumbar posture is determined as bad. The biofeedback mechanism guides the people to identify, change and correct the head/neck or lumbar posture to right positions.

Operation scenarios of the collaborative, social-networked posture training (CSPT) system are summarized into the following five stages: *Preparation*, *Measuring*, *Posture Control*, *Analysis* and *Sharing*, whose details are described as follows:
