Observational research methods involve researchers gathering information by observing behaviors, occurrences, or objects without interfering. There are two types - participant observation where the researcher is involved, and non-participant observation where they observe unobtrusively. Data can be collected quickly through observation, and behaviors are observed as they naturally occur. However, observational research poses ethical issues regarding privacy if it involves tracking individuals without their permission. Experimentation research controls variables to test theories and determine cause-and-effect relationships. It can establish whether an intervention produces the intended result but historically some experiments like the Tuskegee Syphilis study severely disregarded ethics and human rights. Professional codes now aim to ensure research follows ethical standards and benefits society.