Participants receive sufficient notice before items are sent, with the likely arrival or dispatch date, unless the scheme design makes that inappropriate. Detailed documented instructions to all participants include: the need to treat items like routine samples with routine methods unless the scheme requires otherwise; factors that can influence the measurements or tests, such as item nature, storage conditions, any restriction to selected methods and timing; any preparation or conditioning beyond usual practice unless it is part of the scheme; handling and safety instructions; specific environmental conditions for testing and any requirement to report them; precise instructions on recording and reporting results and measurement uncertainties, an expanded uncertainty being reported with its coverage factor and probability, with units, significant figures and reporting basis; instructions on reporting the method used where no single method is required; return or forwarding of items where applicable; the last date for receipt of results; and contact details for enquiries.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.