This paper reports a discussion on the heuristic and applicative objectives of gait analysis and on the experimental and analytical methods used in this context. In particular, the use of an effective method of description of joint kinematics and kinetics i.e., joint function, as applied to the lower limb joints during normal walking is reported. A methodological hypothesis for the evaluation of gait, as an integrated phenomenon is presented and supported by experimental data concerning normal and pathological walking and sportive gaits.