The independent iis Institute organises global interlaboratory studies on fuels, petroleum products, petrochemicals and consumer products. Studies are usually performed on commercially relevant products and involve testing on complete specifications. Besides its annual PT-program, iis organises also tailor made studies on request. Any laboratory may participate using its own routine analytical methods.

NB: sample receipt and test results should be reported via the Internet based data entry portal for petroleum products and (petro) chemicals: https://www.kpmd.co.uk/sgs-iis/ or for consumer products: https://www.kpmd.co.uk/sgs-iis-cts/.