The human response to structural vibration of structures such as dance floors, footbridges and grandstands is becoming more important as structures become lighter and have longer spans, which increases the effect of the human body. It is proposed that the body acts as a mass-spring-damper rather than an inert mass. The relationships between the input, output and the model of the structure may normally be described by governing equations. The study of human-structure interaction is a relatively new topic for which there are relatively few publications. 5 refs.