the regulatory bodies

Primary Research is information that you have started and gathering together on your own using questionnaires, surveys, focus groups and interviews. Also can gather these information by face to face or by telephone.
Advantage of using primary research is that you will be able to know the information is correct and up to date. One of advantage is that you can find some information that no one else will find.
Disadvantage of using primary research will be that the information you will get may not be correct or that is relevant.

Secondary Research is the opposite of Primary Research because all the information you find on magazine or on the internet will have been gathered by someone else in the past.You can use secondary research to help you gather your Primary Research. An good example of Secondary Research will be the views, reviews and rating. 
Advantage of Secondary Research that you will get a large amount of information which will be a  variety of different information.
Disadvantage of Secondary Research is that the information you get maybe false or maybe inaccurate.

Quantitative Research  is the systematic empirical investigation of observable phenomena via statistical, mathematical or computational techniques.
Quantitative research allows the researcher to measure and analyse data. The relationship between an independent and dependent variable is studied in detail. This is advantageous because the researcher is more objective about the findings of the research. 
The main disadvantage of quantitative research is the context of the study or experiment is ignored. Quantitative research does not study things in a natural setting or discuss the meaning things have for different people as qualitative research does.

Qualitative Research is a research that is based on attitudes, toughs, opinions instead of facts and percentage.
Advantage to qualitative research is the researcher gains more detailed and rich data in the form of comprehensive written descriptions or visual evidence, such as photographs.
The researcher of a study using qualitative research is heavily involved in the process, which gives the researcher a subjective view of the study and its participants.

Objective questions are those that require a specific answer. An objective question usually has only one potential correct answer, and they leave no room for opinion.

Subjective questions are based on attitudes, beliefs or opinions, instead of on verifiable evidence or phenomenon.

Reliable questions is a measure of reliability by administering the same test twice over a period of time to a group of individual. The score from time 1 and time 2 can then be correlated in order to evaluate the test for  stability over time.

Valid questions are one that has relevance and some degree of connectivity to the topic. It is logical consistent.