In most cases, double blind studies are an effective way of performing a research study and learning new information about a drug or new treatments. Double blind studies are also a way of removing bias from the testing of these drugs. Any previous knowledge that an investigator may have can affect on the outcome of how the new drug is analyzed. In the case of Alzheimer’s mentioned above, there are many benefits to conducting a double blind study. Psychologically, neither the patient, nor the investigator can tell if the treatment received is a placebo or a real drug and therefore it cant affect the outcome of the study. It is evident that the main reason double blind studies are conducted is to prevent bias from both parties. This can only be done by removing all certainties that come with performing a single blind study. Although this increases liabilities, it is an effective way of eliciting effective results.