Estimating the Rasch Testlet Model

[DMarengo]

Hi everyone,
I am trying to estimate the Rasch Testlet Model in Conquest, but I have some doubt concerning how to implement the requested design matrix.
I am using as a reference the information reported at this link: http://www.artofreduction.com/en/beispiel-zur-berechnung-des-testlet-modells/
and here:
http://www.ierinstitute.org/fileadmin/Documents/IERI_Monograph/IERI_Monograph_Volume_01_Chapter_3.pdf

Specifically, it is said that to run the model it is necessary to import a specific design matrix, but I am not really sure how to define it.
In his paper on the estimation of the subdimension model, Steffen Brandt suggests to export the design matrix  obtained through the estimation of the unidimensional model, and then import it in the estimation including subdimensions.
Should I do the same when running the Rasch Testlet estimation?

Thanks for your time
Best
Davide

[ConQuest]

Yes Davide, Steffen's papers are quite good and detailed explanations of how to accomplish this.  Perhaps you could email him directly for more detailed assistance.
Ray