Topics: The Partial Credit Model, U-conditional threshold-probabilities, The two assumptions defining the Partial Credit Model and the definition of the latent variable, Interpretation of the threshold parameters, Graphs of the U-conditional threshold-probabilities for different categories as a function of the latent variable, Graphs of the U-conditional probabilities for different categories as a function of the latent variable, Ways of fixing the (version of the) latent variable, Using the Partial Credit Model for four items of the scale „well-being“ of the Multidimensional Mood State Questionnaire with Winmira, Interpretation of the output of Winmira