Step length is a common measurement taken during gait analyses. It allows one to determine asymmetries between the two legs, compare differences between subjects, and even compare intra-subject differences for changing parameters. Yet there has been little investigation of step length specifically and how it is modulated during walking. This dissertation explores the methods by which different groups of people modulate their step length. It was hypothesized that step length is modulated by several different means: increasing hip flexion and extension, increasing ankle-foot roll over arc length; increasing stance foot heel rise to further extend the trailing limb, and increasing pelvic rotation.