Easy to use graphical user interface
One, two and three-parameter logistic models
Samejima's model for graded responses
Bock's model for nominal (non-ordered) responses
Steinberg's model for multiple-choice items
Handling of multiple-alternative items, such as multiple-choice tests or Likert-type attitude questionnaires
Scoring of items with multiple alternatives
Differential item functioning (DIF)
Handling of data from several populations simultaneously
Analysis of mixtures of items types
Testing of item parameters across groups
Handling of equality constraints and fixed parameters
Presentation quality IRT graphics, can be imported in Word, Access, etc.
Detailed online HELP documentation includes description of interface, syntax, and examples.

A research-oriented IRT program that handles all the major models: 1, 2, and 3 parameter logistic, multiple nominal categories, graded rating scale model, partial credit model, multiple-choice model, and constrained parameter models.

Previously only available as DOS software, MULTILOG has been updated to the current Windows operating systems: 98, NT, 2000, ME, and XP. Extensive online Help has been added, covering almost completely the newly edited book that combines all four programs in one volume.

Annotated program input and output can be found throughout the online Help system and the new manual. A graphic module adds item characteristic curves, item information curves, and test information curves to MULTILOG. The plots may be saved in the Windows Metafile format (WMF) and are then easily included in applications such as MS Word.