![]() External validity, meanwhile, relates to whether or not research findings can be generalised beyond the immediate study sample and setting. Internal validity relates to the extent to which the design of a research study is a good test of the hypothesis or is appropriate for the research question (Carter and Porter 2000). hitemal and external validity relate to the overall study design. ![]() There are several measures of validity that provide evidence of the quality of a study. Validity means that a tool measures what it sets out to measure-for example, that a pain assessment tool measures pain intensity rather than anxiety. This and the next artide in this series will define validity and reliability, and will explain how you can ascertain whether a quantitative research study is both valid and reliable. When reading a paper, it is necessary to consider the validity and reliability of the study being described. Just because a research study has been published in a journal does not mean that it is good research or that the results are applicable to your area of clinical practice. ![]()
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