Psychometry
Psychometry evaluation consist of using statistical techniques, testing the measurement properties of an instrument 5. There are several measures to evaluate an instrument, the main ones being: classical test theory (CTT) and modern test theory (MTT)5.
The classical test theory is the most widely used and known theory, whose psychometric characteristics considered to be minimum prerequisites are: scale structure, validity, reliability and responsiveness 5,6.
Modern test theory consists of models, such as the item response theory (IRT), which are innovative techniques for testing the psychometric characteristics of an instrument 5.