Multivariate Normal Mean Monitoring Through Critical-to-X Control Chart R package CTxCC version 0.4.0 A comprehensive set of functions designed for multivariate mean monitoring using the Critical-to-X Control Chart. These functions enable the determination of optimal control limits based on a specified in-control Average Run Length (ARL), the calculation of out-of-control ARL for a given control limit, and post-signal analysis to identify the specific variable responsible for a detected shift in the mean. This suite of tools provides robust support for precise and effective process monitoring and analysis. Software Depends: combinat, matrixcalc, stats, mvtnorm, expm, CompQuadForm, ggplot2 Diana Barraza-Barraza <diana.barraza@ujed.mx> Comprehensive R Archive Network (CRAN) Burcu Aytaçoğlu [aut] (burcuaytacoglu@gmail.com), Diana Barraza-Barraza [aut, cre] (diana.barraza@ujed.mx), Víctor G. Tercero-Gómez [aut] (victor.tercero@tec.mx), A. Eduardo Cordero-Franco [aut] (lalo.cordero@gmail.com) GPL (>= 2) 2025-08-27 application/tgz https://CRAN.R-project.org/package=CTxCC doi:10.32614/CRAN.package.CTxCC