Performs assignments related to the construction, maintenance, and validation of credentialing assessments. Conducts statistical analyses of test items and examinations (e.g., item calibration, form assembly, equating, scaling and psychometric monitoring) using CTT and IRT (Rasch, 2PL, and 3PL) methods. Very experienced with Winsteps, BILOG MG, Parscale, Polyequate, and o