An investigation of a healthcare problem. There are different types of studies used to answer The term research means different things to different people, but is essentially about finding out new knowledge that could lead to changes to treatments, policies or care. questions, for example randomised A trial in which a group (the ‘intervention group’) is given a intervention being tested (for example a drug, surgery, or exercise) is compared with a group which does not receive the intervention (the ‘control group’). or A study in which the researchers look at what happens over time to groups of people. They study changes or differences in one characteristic (e.g. whether or not people smoke) in relation to changes or differences in another characteristic (e.g. whether or not they get cancer)..