This is a nice overview of why you want to randomize. It also talks about block randomization and covariate adaptive randomization.

KP Suresh. An overview of randomization techniques: An unbiased assessment of outcome in clinical research. J Hum Reprod Sci. 2011 Jan-Apr; 4(1): 8–11. doi: 10.4103/0974-1208.82352. Available in html format.

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This Recommendation was added to the website on 2019-02-05 and was last modified on 2020-02-29. You can find similar pages at Randomization.

An earlier version of this page appears here.