Randomization introduces an element of chance into the allocation of a study treatment to a subject. It prevents allocation bias and ensures the validity of statistical methodologies and conclusions. Randomization systems can vary from something as simple as a paper list to highly complex computerized web-based systems. It is important that a statistician is involved in selecting the most appropriate methodology for the study. The Emtex statistician has over 25 years of experience and will be happy to support.