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Second, I make a distinction between two broad types: translation validity and criterion-related validity. That's because I think these correspond to the two major ways you can assure/assess the validity of an operationalization.
Research validity in surveys relates to the extent at which the survey measures right elements that need to be measured. In simple terms, validity refers to how well an instrument as measures what it is intended to measure.
External validity is about generalization: To what extent can an effect in research, be generalized to populations, settings, treatment variables, and measurement variables? External validity is usually split into two distinct types, population validity and ecological validity and they are both essential elements in judging the strength of an experimental design. Each type of validity has many threats which can pose a problem in a research study. Examples, but not an exhaustive discussion, of threats to each validity will be provided. For a comprehensive discussion of the four types of validity, the threats associated with each type of validity, and additional validity issues see Cook and Campbell ().
These types of validity are relevant to evaluating the validity of a research study / procedure. Internal validity refers to whether the effects observed in a study are due to the manipulation of the independent variable and not some other fast-tri-29.cf: Saul Mcleod. Research Methods in Psychology. Chapter 5: Psychological Measurement. Reliability and Validity of Measurement Learning Objectives. Define reliability, including the different types and how they are assessed. Define validity, including the different types and how they are assessed.