The monograph Development of the Brinell Method for Macro-, Micro-, and Nano Ranges is a groundbreaking scientific work that redefines classical hardness testing for the challenges of the 21st century. Designed for materials scientists, engineers, and students, it blends tradition with innovation to adapt the Brinell method for precise applications at the micro- and nanoscale. In Chapter 1, readers explore the theoretical foundations and international standards behind Brinell testing, along with key insights into how load, indenter shape, and indentation recovery influence results. Chapter 2 unveils a novel classification of hardness-surface, projected, and volume-measured using a spherical-conical indenter, and dives into cutting-edge techniques for analyzing penetration depth, contact area, and modulus, while indentation size effects (ISE/RISE). Chapter 3 delivers expert guidance for modernizing Brinell testers with advanced instrumentation, digital software, and force-depth analytics. Enriched with diagrams, data, and real-world examples, this monograph is both an authoritative scientific reference and an indispensable guide for mastering next-generation hardness testing.