What is ISO 16840-13 about?
ISO 16840 discusses standards for wheelchair seating. ISO 16840-13 is one of a series of documents focuses on determination of the lateral stability property of a seat cushion. ISO 16840-13 specifies apparatus, test methods, and disclosure requirements for the determination of lateral stability properties of wheelchair seat cushions by measuring the response from the cushion to a shift in the centre of mass of the load on the cushion.
ISO 16840-13 provides a method of determining changes in a particular physical and mechanical property of the cushion. It does not provide information specific to cushion performance for a particular individual user. It does not provide information related to anterior-posterior stability, nor to stability contributions from cushion edges.