This part of ISO 7176 specifies methods for the determination of wheelchair dimensions and mass. This includes specific methods for the determination of outside dimensions when the wheelchair is occupied by a reference occupant and the required manoeuvring space needed for wheelchair manoeuvres commonly carried out in daily life. This part of ISO 7176 specifies requirements for the disclosure of the dimensions and masses and contains five informative annexes. Annex A specifies methods for the determination of technical dimensions that can be important to the performance of the wheelchair. Annex B provides detailed information about pivot width and reversing width. Annex C provides detailed information about the turning diameter. Annex D provides details on determining the wheelchair longitudinal axis and wheelchair centre-point. Annex E provides technical guidelines and recommendations for many of the measurements specified to facilitate improved understanding, design and construction of wheelchairs. This part of ISO 7176 is applicable to manual wheelchairs and electrically powered wheelchairs (including scooters).