Threshold-Sweep QCA R package ThSQCA version 2.0.6 Provides threshold sweep methods for Qualitative Comparative Analysis (QCA). Implements Condition Threshold Sweep-Single (CTS-S), Condition Threshold Sweep-Multiple (CTS-M), Outcome Threshold Sweep (OTS), and Dual Threshold Sweep (DTS) for systematic exploration of threshold calibration effects on crisp-set QCA results. These methods extend traditional robustness approaches by treating threshold variation as an exploratory tool for discovering causal structures. Also provides Fiss (2011) <doi:10.5465/amj.2011.60263120> core/peripheral condition classification via compute_fiss_core() and generate_fiss_chart(), enabling four-symbol configuration charts that distinguish core conditions (present in both parsimonious and intermediate solutions) from peripheral conditions (intermediate only). Built on top of the 'QCA' package by Dusa (2019) <doi:10.1007/978-3-319-75668-4>, with function arguments following 'QCA' conventions. Based on set-theoretic methods by Ragin (2008) <doi:10.7208/chicago/9780226702797.001.0001> and established robustness protocols by Oana and Schneider (2024) <doi:10.1177/00491241211036158>. This package supersedes 'TSQCA'; see the NEWS file for migration guidance. Software Depends: R (>= 4.0) Imports: QCA Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Yuki Toyoda <yuki.toyoda.ds@hosei.ac.jp> Comprehensive R Archive Network (CRAN) Yuki Toyoda [aut, cre], Japan Society for the Promotion of Science [fnd] (KAKENHI Grant Number JP20K01998) MIT + file LICENSE (https://CRAN.R-project.org/package=ThSQCA/LICENSE) 2026-07-31 application/tgz https://CRAN.R-project.org/package=ThSQCA doi:10.32614/CRAN.package.ThSQCA