Data Cleaning Center for Survey and Assessment Data R package DCC version 1.2.1 Rule-driven, auditable cleaning of survey and assessment response data, implementing the WeianData Detect-Execute-Report workflow. Provides a multi-format, multi-encoding input layer (CSV, 'Excel', 'SPSS', 'Stata', 'SAS', Parquet, JSON), the dcc_data container with a provenance chain, level-0 structural diagnostics, five built-in response-quality detectors (missing items, straight-lining, response time, trap items, score anomalies), a declarative YAML rule engine, an execution engine with a cell-level audit log, answer-key scoring, multi-form to master item bank mapping, a normalized report model rendered as bilingual staff workbooks and HTML, complete statistical bundles, and versioned machine JSON/JSONL with findings-to-changes reconciliation, cell-level lineage tracing, and manifest-based one-command reproduction. Includes a protected bilingual strict project workbook and matching JSON contract with cell-addressed validation, non-mutating preflight, preview-first execution, and localized staff guidance. All formally supported input backends install with the package; PDF is optional rather than a fixed report output. Software Depends: R (>= 4.1) Imports: arrow, data.table (>= 1.14.0), haven (>= 2.5.5), jsonlite, openxlsx2 (>= 1.28), readODS (>= 2.3.5), readxl (>= 1.5.0), stringi (>= 1.7.0), methods, stats, tools, utils, writexl, yaml Suggests: knitr, rmarkdown, testthat (>= 3.0.0), withr Kunxiang Ma <makunxiang@weiandata.com> Comprehensive R Archive Network (CRAN) Kunxiang Ma [aut, cre], WEIAN DATA TECH (Beijing) Co., Ltd. [cph, fnd] GPL (>= 2) 2026-09-25 application/tgz https://CRAN.R-project.org/package=DCC doi:10.32614/CRAN.package.DCC en