Psychometric test construction 

Psychological tests are systematic applications of a few relatively simple principles to measure personal attributes important for describing or understanding behaviour. They are typically the most accurate, reliable, and cost-effective way to obtain the information required to make informed decisions about individuals. However, measuring psychological attributes is not as simple as measuring physical properties such as the height, weight, or velocity of an object. Individuals' psychological attributes will only manifest in their behaviour. To complicate matters further, behaviour rarely reflects a single psychological attribute, but rather a combination of physical, psychological, and social forces. Therefore, familiarity with the specialised methods of psychological measurement is required for the sensible evaluation of psychological attributes. Nevertheless, the variety of psychological tests is incredible, ranging from personality inventories to perceptual tests. Three common features that are evident in all these tests include behaviour samples, standardization, and scoring rules. When creating a psychological test, the assistance of a psychometrics expert will help eliminate the ambiguity associated with these three features.