The natural course of cerebral palsy (CP) can be modulated by treatments and therapies that are nowadays mostly decided on the basis of assessments performed in clinical settings, through the Clinical Gait Analysis. However, it is not clear whether gait assessments in clinics (capacity) are representative of daily-life behaviors (performance). The present thesis aimed at exploring the gap between gait assessed in the laboratory and in real life for children with CP, as compared to children with typical development. Inertial measurement units, including accelerometers and gyroscopes, were exploited as a solution to measure gait features in the children's s daily life. The clinical results proved with objective and quantitative evidence the existence of a systematic gap between gait assessed in the laboratory and gait in real life, which could help clinicians to devise therapeutic plans better tailored to each child's needs.