Bayesian Optimal Block Designs R package Boptbd version 1.0.7 CRAN Task View: CausalInference (https://CRAN.R-project.org/view=CausalInference) Computes Bayesian A- and D-optimal block designs under the linear mixed effects model settings using block/array exchange algorithm of Debusho, Gemechu and Haines (2018) <doi:10.1080/03610918.2018.1429617> and Gemechu, Debusho and Haines (2025) <doi:10.5539/ijsp.v14n1p50> where the interest is in a comparison of all possible elementary treatment contrasts. The package also provides an optional method of using the graphical user interface (GUI) R package 'tcltk' to ensure that it is user friendly. Software Depends: R (>= 3.4.0), MASS, Matrix, igraph, tcltk Dibaba Bayisa Gemechu <diboobayu@gmail.com> Comprehensive R Archive Network (CRAN) Dibaba Bayisa Gemechu [aut, cre], Legesse Kassa Debusho [aut], Linda Haines [aut] GPL-2 2025-05-24 application/tgz https://CRAN.R-project.org/package=Boptbd doi:10.32614/CRAN.package.Boptbd