Topics: Interpretation of the Q-statistics in Winmira for the items Bootstrap model test, Generating data according to the Rasch modell Analysis of the generated data with Winmira, Generating data according to the Birnbaum model, Analysis of the generated data with Winmira, in particular the Q-statistics and bootstrap procedure, Generating data according to the Birnbaum model according to a latent variable model with two latent variables, Analysis of the generated data with Winmira