Distinguish between primary and secondary research resources.

Primary research resources is when the researcher does not change anything in the answers or data that the respondents gave. The researcher just write down the report based on what the respondents give without changing anything towards respondents answers therefore, primary research resources is highly valid.

Secondary research resources is when the researcher might add another information that he/she in the answers that the respondents give in making the report. For example : mass media, newspaper, etc. we do not know the information that the researcher add on is 100% valid or not therefore, secondary research resources is not highly valid.