Surveys, experiments and quasi-experiments are used.
Glanz et al (2002) use therapeutically techniques as well. Techniques such as biofeedback, relaxation and visual imagery are used. Biofeedback aims to develop awareness and control of responses to stressors. Furthermore, biofeedback reduces stress and tension in response to everyday situations. Relaxation techniques use a constant mental stimulus, passive attitude and a quiet environment. Techniques that are used are relaxation training, hypnosis and yoga. Visual imagery is a technique used for improving the mood of a person and improving coping skills. This can be done for example with visualizing host defenses destroying tumor cells.