If you have finally decided to bite the bullet and want to learn about IRT (item response theory) in psychological and educational test development, and the Rasch model in particular, I would recommend checking the following web page.....Item Response Theory. IRT-based tests are increasingly becoming the norm in psychoeducational assesment, and test developers and users need to get familiar with the basics in order to better evaulate and appreciate existing and new asessment instruments that hit the market. This site is where I would start.
This page includes links to the major Rasch resources on the internet, commercial and free software and, free access to an on-line IRT book, chapter-by-chapter. Great stuff.
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