Descriptive 3D Multidimensional Item Response Theory Modeling R package D3mirt version 2.0.5 CRAN Task View: Psychometrics (https://CRAN.R-project.org/view=Psychometrics) For identifying, estimating, and plotting descriptive multidimensional item response theory models, restricted to 3D and dichotomous or polytomous data that fit the two-parameter logistic model or the graded response model. The method is primarily exploratory and centered on the plot function, which exposes item characteristics and constructs, represented by vector arrows, within a three-dimensional interactive latent space. The results can be useful for item-level analysis as well as test development. Software Depends: R (>= 3.6.0) Imports: mirt, rgl (>= 1.3.1) Suggests: knitr, rmarkdown, stats, testthat, R.rsp Erik Forsberg <forsbergpsychometrics@gmail.com> Comprehensive R Archive Network (CRAN) Erik Forsberg [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-5228-9729>) GPL (>= 3) 2026-06-07 application/tgz https://CRAN.R-project.org/package=D3mirt doi:10.32614/CRAN.package.D3mirt