Partially Residual Balanced Multi-Session Designs R package PRBMSdesigns version 1.0.1 Provides functions for generating novel partially residual balanced multi-session designs. These designs arrange products over sessions and periods under partial balance restrictions and compute canonical efficiency factors for direct and residual (carryover) effects. For general background on PRBMS and related crossover design literature, see Aggarwal and Jha (2006) <doi:10.1080/03610920600695824> and Fardos et al. (2023) <doi:10.18576/jsap/120227>. Software Imports: MASS Boyina Devi Priyanka <boyinadevipriyanka@gmail.com> Comprehensive R Archive Network (CRAN) Boyina Devi Priyanka [aut, cre], Cini Varghese [ctb], Rajender Parsad [ctb], Mohd Harun [ctb], Anindita Datta [ctb], Vinaykumar L.N. [ctb] GPL-2 2026-05-02 application/tgz https://CRAN.R-project.org/package=PRBMSdesigns doi:10.32614/CRAN.package.PRBMSdesigns