Randomised controlled trial

I like to turn to the basic study design therefore used to confirm or refute the hypothesis. The first type of study, randomised trial also called as randomised clinical trial because it often use to testing new therapy. What is the design showing here? We begin with a study population and we randomly assign the study population into current treatment or new treatment. We then follow up both groups of patients and determine how many dies from the disease in current treatment and how many dies from the disease in new treatment. If the new treatment is more effective than the current treatment we would expect to see fewer people die from the disease in the new treatment than we see in current treatment. 

So the design of randomised trial is basically a simple one. And it is very desirable type of study. The act can be carried only if we looking at a potentially beneficial prevention. If we have toxic or potentially toxic substances or putative carcinogens clearly we cannot randomised in human population. Nevertheless randomised trail is often considered gold standard. A standard of truth that we try to emulate even in another type of study design.