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Feature-packed is Lertap 5. Have a browse of the topics listed below to get an idea of some of its features and capabilities.
•It's easy to use
•Heaps of documentation
•Simple but really powerful control language
•Graphs? (we got 'em, even with a gestalt capability)
•Sample datasets? You bet!
•Certification and licensing is here
•Looking for group differences (DIF+)
•Comprehensive item flags