TY - JOUR T1 - Teaching tip: the invisible hand of randomisation JF - Evidence Based Medicine JO - Evid Based Med SP - 5 LP - 5 DO - 10.1136/ebm.11.1.5 VL - 11 IS - 1 AU - Sharon Sanders AU - Grad Dip Child Devel Y1 - 2006/02/01 UR - http://ebm.bmj.com/content/11/1/5.1.abstract N2 - This engaging activity, fun for students and teachers alike, shows both the benefits of randomisation and allocation concealment. It can also show the problems that may arise as a result of subversion of the process and small study size. METHOD: Purchase 2 different types of wrapped lollies (aka candy or sweets) and a pack of opaque envelopes. Place the lollies in the envelopes and seal. Arrange the envelopes as for … ER -