Clinical trials can be designed in different ways in accordance to their research question: Prevention trials: trials for the search of better ways to prevent diseases. These approaches may include medicines, vitamins, vaccines, minerals, or lifestyle changes. Diagnostic trials: trials that are conducted to find better tests or procedures for diagnosing a particular disease. Screening trials: trials to test the best way to detect certain diseases. Quality of Life: trials (or Supportive Care trials) for improving the quality of life for individuals with a chronic illness.
