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Certain terms are very commonly used in research and the success of any research depends on these terms. These terms determine whether research is free of biases, prejudices and subjective errors or not.

 

a) Reliability is a subjective term which cannot be measured precisely but today there are instruments which can estimate the reliability of any research. Reliability is the repeatability of any research, research instrument, tool or procedure. If any research yields similar results each time it is undertaken with a similar population and with similar procedures, it is called to be reliable research. Suppose research is conducted on the effects of separation between parents on the class performance of the children. If the results conclude that separation causes low grades in class, these results should have to be reliable for another sample taken from a similar population. More the results are similar; more reliability is present in the research.

b) Validity is the strength with which we can call research conclusions,
assumptions or propositions true or false. Validity determines the applicability of research. The validity of the research instrument can be defined as the suitability of the research instrument to the research problem or how accurately the instrument measures the problem. Some researchers say that validity and reliability are co-related but validity is much more important than reliability. Without validity, research goes in the wrong direction. To keep the research on track define your concepts in the best possible manner so that no error occurs during measurement.

c) Accuracy is also the degree to which each research process, instrument, and the tool is related to each other. Accuracy also measures whether research tools have been selected in best possible manner and research procedures suit the research problem or not. For example if a researcher has to be conducted on the transgender people, several data collection tools can be used depending on the research problems but if you find that population less cooperative the best way is to observe them rather than submitting questionnaire because in questionnaire either they will give biased responses or they will not return the questionnaires at all. So choosing the best data collection tool improves the accuracy of research.

d) Credibility comes with the use of the best source of information and best procedures in research. If you are using second-hand information in your research due to any reason your research might complete in less time but its credibility will be at stake because secondary data has been manipulated by human beings and is therefore not very valid to use in research. A certain percentage of secondary data can be used if the primary source is not available but basing a research completely on secondary data when primary data can be gathered is least credible. When the researcher give accurate references to research the credibility of research