**1. Introduction**

The main purpose of this chapter is to present a clinical and scientific perspective of the applicability of self-report outcome measures on the assessment of rehabilitation intervention designed to treat ankle/foot disorders. Some aspects about the development of these clinical tools will be briefly discussed in order to offer clinicians and scientists some criteria to better select an appropriate measure for a given clinical goal. In addition, a presentation is given of how the item response theory (IRT), by using Rasch analysis, can be used to assess such clinical measurement tools and to enrich rehabilitation data concerning clinical intervention effectiveness.
