Diagnostic classification models (DCMs; also called cognitive diagnostic models [CDMs]) are psychometric models used for educational and psychological measurement. DCMs are multidimensional, and result in a categorical profile of skills demonstrated by the respondent on the assessment. r-dcm provides a suite of tools for implementing DCMs in applied practice with R. This includes the estimation and evaluation of DCMs (measr), reporting results (thresholdr), and example data sets (dcmdata).