Testlet Response Theory and Its Applications

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mirt: A Multidimensional Item Response Theory Package for the R Environment (2012, methodology): “This model has the beneﬁt of having a ﬁxed number of quadratures regardless of the number of speciﬁc factors estimated, and is closely related to ‘Testlet’ response models (Wainer, Bradlow, and Wang 2007).”
Metropolis-Hastings Robbins-Monro Algorithm for Confirmatory Item Factor Analysis (2010, methodology): “Wainer et al. (2007) use Bayesian MCMC methods to fit their models whereas I use maximum likelihood.”
Modeling Differential Item Functioning Using a Generalization of the Multiple-Group Bifactor Model (2013, unknown): “Testlet models (Bradlow et al., 1999; Wainer, Bradlow, and Wang, 2007) are typically used to accommodate local item dependence among groups of items (the testlets) having a common stimulus.”
Beyond dichotomies: Competence viewed as a continuum (2015, background): “In some situations solutions may be found by creating testlets (Wainer et al., 2007), but development of specialized models to deal with this issue may also be needed.”