CDISC-Gloss – A technique for retaining the blind when administering supplies in a clinical trial, when the two treatments cannot be made identical. supplies are prepared for Treatment a (active and indistinguishable placebo) and for Treatment B (active and indistinguishable placebo). subjects then take two sets of treatment; either a (active) and B (placebo), or a (placebo) and B (active). [ICH E9].