A Tidyverse-First Research Design Declaration and Diagnosis Tool R package DeclareDesign version 2.0.0 Declares, simulates, diagnoses and redesigns research designs. A design is declared as a model, an inquiry, a data strategy and an answer strategy, then simulated with 'purrr' and diagnosed with 'dplyr'. Version 2.0 is a ground-up rewrite of the package on tidyverse conventions. Software Depends: R (>= 4.1.0), randomizr (>= 1.0.1), fabricatr (>= 2.0.0), estimatr (>= 2.0.0) Imports: broom, dplyr, generics, parallel, purrr, rlang, tibble, tidyr, utils Suggests: furrr, future, knitr, MASS, progressr, rmarkdown, testthat (>= 3.0.0), withr Alexander Coppock <acoppock@gmail.com> Comprehensive R Archive Network (CRAN) Alexander Coppock [aut, cre] (ORCID: <https://orcid.org/0000-0002-5733-2386>), Graeme Blair [aut] (ORCID: <https://orcid.org/0000-0001-9164-2102>), Jasper Cooper [aut] (ORCID: <https://orcid.org/0000-0002-8639-3188>), Macartan Humphreys [aut] (ORCID: <https://orcid.org/0000-0001-7029-2326>), Neal Fultz [aut] MIT + file LICENSE (https://CRAN.R-project.org/package=DeclareDesign/LICENSE) 2026-10-25 application/tgz https://CRAN.R-project.org/package=DeclareDesign doi:10.32614/CRAN.package.DeclareDesign