Readability refers to how well Cochrane Reviews can be read and understood by users of the Cochrane Database of Systematic Reviews (CDSR). It is a part of the mission and a basic principle of Cochrane to promote the accessibility (readability) of Cochrane Reviews of the effects of healthcare interventions to anyone wanting to make a decision about health care. Cochrane Reviews should be written so that they are easy to read and understand by someone with a basic sense of the topic who may not necessarily be an expert in the area. Some explanation of terms and concepts is likely to be helpful, and may be essential. Simplicity and clarity are also vital to readability.