Labor (2) People with disabilities (2) Evaluation (2) Design (2) Evaluación (2) Estudio (2) Diseño (2) Trabajo (2) Personas con discapacidad (2) Cell phone systems (1) Certification (1) Technology (1) Technical assistance (1) Statistics (1) Sampling (1) Rehabilitation (1) Paraplegia (1) Motion (1) Methodology (1) Leg (1) Joints--Range of motion (1) Identification (1) Human engineering (1) Hearing aids (1) Factor analysis (1) Experience (1) Error (1) Earmolds (Hearing aids) (1) Ear (1) Designers (1)