This text provides a systematic treatment of completely regular semigroups, from beginner to research level, comprising: preliminaries on lattices, semigroups, varieties and complete regularity; congruences and relations on the congruence lattice; and completely regular semigroups.

Present a systematic treatment of completely regular semigroups, from introductory to research level, comprised of preliminaries on lattices, semigroups, varieties, and complete regularity; congruences and relations on the congruence lattice; and varieties of completely regular semigroups through kernals, and traces of congruences and Malcev products.