An operator may disapply an accessibility requirement only to the extent that meeting it would fundamentally alter the basic nature of the product or service or impose a disproportionate burden, and only after an assessment concluding so; the burden assessment must use the Schedule 4 criteria (ratio of net compliance costs to the operator's overall costs or net turnover, estimated benefits for persons with disabilities, product life and usage). An operator receiving external public or private funding to improve accessibility cannot claim disproportionate burden.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.