Research Experiment conduct internal validity, a systematic plan for doing research such as gender, age, and race.
Survey conduct, is most commonly use form of collected research from informal interview, by hand deliver mail, telephone, face book , observation, interview and questionnaire relate. This data come from the primary source
Participant Observation collected information about social research is necessary when conducting studies on marry couple
Secondary Research Is the finding from other research that included but not limits to book, report, internet, TV, face book all this evidence are collected to support one idea or conclusions