What Is Measurement.- Construct, Framework and Test Development - from IRT Perspectives. - Test Design.- Test Administration and Data Preparation.- Classical Test Theory.- An Ideal Measurement.- Rasch Model (The Dichotomous Case).- Residual-based Fit Statistics.- Partial Credit Model.- Two-parameter IRT Models, - Differential Item Function.- Equating.- Facets Models.- Bayesian IRT Models (MML estimation).- Multidimensional IRT models.