This package provides S7'-based infrastructure for survey analysis. Supports Taylor series, replicate weight, and two-phase designs following the methods in Lumley (2004) <doi:10.18637/jss.v009.i08>. Includes design-based estimators such as means, frequencies, and regression models, with weighted polychoric and polyserial correlation following Mannan (2025) <doi:10.2139/ssrn.6580480>. A metadata system automatically preserves haven'-style variable labels, value labels, and question-preface attributes through all operations. Uses a tidyselect interface for design specification.