The aim of this clinical investigation is to develop a reliable and valid device to instantly measure the subject's sitting posture in a wheelchair, without using the MCPAA scale.

Each subject will be invited to a single experimental session lasting approximately one hour, during which all assessments will be performed.

During the visit, the patient will complete an autonomy questionnaire and assess wheelchair fatigue. A spirometry test will be performed.

The measurements will then be recorded by the BePoW software and the occupational therapist.

Inclusion Criteria:

• Over 18 years of age,
• Having freely consented to participate in the study (or their legal representative in the case of guardianship, in agreement with the patient),
• In the case of a guardianship, the legal representative having read the information document intended for the legal guardian of an adult under legal protection (under guardianship) and given his/her free and informed consent for the person for whom he/she is responsible to participate in the study (in agreement with the patient).
• Temporarily or permanently wheelchair-bound,
• Affiliated with a social security scheme or beneficiary of such a scheme.

Exclusion Criteria:

• Has comprehension problems that prevent him/her from giving free and informed consent and from completing the investigation (following instructions, answering questionnaires),
• Suffering from a pathology (Huntington's disease, Sydenham's Chorea) preventing stable sitting posture during participation in the investigation,
• Have undergone an amputation that prevents the BePoW device from taking measurements,
• having undergone a tracheotomy preventing spirometry.
• Pregnant, parturient or breast-feeding women,
• Person deprived of liberty by a judicial decision (except guardianship or curatorship) or or administrative decision, a person under psychiatric care or admitted to a or social establishment for purposes other than research,
• Minors,
• Person in an emergency situation unable to give prior consent.