Generation and Analysis of 3-Level, 4-Level and 5-Level Factorial Block Designs // Provides tools to generate and analyze 3-level, 4-level and 5-level linear factorial block designs, including complete factorial layouts, fractional factorial layouts, confounded factorial layouts, and design- characteristic summaries. The package includes utilities for recursive construction, defining-contrast identification, alias and confounding summaries, incidence matrix construction, and selected design-characteristic diagnostics. The methodological framework follows foundational work on factorial block designs, including Gupta (1983) doi:10.1111/j.2517-6161.1983.tb01253.x.