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This document provides guidance on the mapping of the set of user accessibility needs with the provisions of a particular standard, technical report, or set of guidelines. It provides both basic guidance that should be used for all user accessibility needs mapping and optional guidance that may be added to the basic guidance.
User accessibility need mapping is intended to help improve accessibility for all users and in particular for users with special needs that might otherwise be overlooked. User Accessibility Need Mapping is not intended to be used to evaluate, certify, or otherwise judge a given standard or set of guidelines.

This document specifies requirements for repetitive, static, impact, and repetitive load strengths for postural support devices (PSDs) with associated attachment hardware intended for use with an undefined wheelchair seating system. It specifies the test methods for determining whether the minimum performance requirements have been met to release a product into use. It also specifies requirements for disclosure of the test results. Not all tests apply to all PSDs. It is also applicable to other seating systems.
The test methods can be used to verify the manufacturer’s claims that a product meets the requirements of this document. This document does not apply to PSDs that are designed to fail under certain static, dynamic, or repetitive loads.
This document does not apply to the strength of PSDs under crash conditions in a motor vehicle.
This document does not evaluate long term useful life.
NOTE 1 ISO 16840-4 provides crash test methods and requirements for wheelchair seating systems when used as part of a wheelchair seat in a motor vehicle.
NOTE 2 For user masses greater or less than those specified in this document, appropriate extrapolation of test apparatus dimensions, mounting point separation, forces, etc. are permitted, and the test parameters noted in the test report.
NOTE 3 Rigid surrogate test fixtures are utilized to provide a standardized test method, and consequently this document does not involve a test of a PSD on a particular wheelchair.