Standards for validating health measures definition and content
Many are misled by the compelling connotations of the word ‘validated’.
The term implies a generality and finality which is incorrect.
A concept such as intelligence, is commonly the result of a number of elements: verbal, numerical, spatial skills, problem solving, memory, etc.
In turn, each of these may not be clearly identified by the answer to a simple question, but may require a series of questions and answers.
In principle, the concept of ‘validity’ is straight forward. A valid instrument measures what it purports to measure.